The neck where you pull down to put a drill bit in won't slide down any

grasp the part below where the bit goes in and slide it down [towards the trigger] - drop in bit and release

Remove the cap and the circlip underneath and slide it all forward. Pull back plate holding the small ball and remove it. Put drill bit into a vice and pull on the machine. If it still won't come out you might have to tap on the main spindle with a copper hammer to knock the spindle off. Check the spindle for damage before reassembling.

Instructions

1. 
   
   
   
   
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     1
     
     
     Unscrew the passenger seat\'s mounting bolt, positioned on
     the rear of the seat, using a socket wrench and a 10 mm socket. Lift the
     passenger seat up and away from the rider\'s seat.
     
     
     
   
   
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     2
     
     
     Flip the passenger seat upside down and place it on a clean
     work area. Pry out the seat cover\'s staples from the bottom of the seat
     pan with a small pry bar or staple puller. Pull off the vinyl cover and
     remove the foam from the seat pan.
     
     
     
   
   
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     3
     
     
     Flip the seat pan over. Place the Utopia back rest bar over
     the top of the seat pan, following the contours of seat pan. Center the
     bar in the middle of the pan, then mark the location of the bar\'s
     mounting holes on the seat pan with a permanent marker. Remove the back
     rest bar.
     
     
     
   
   
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     4
     
     
     Drill two holes into the seat pan at the marked locations,
     using an electric drill and a 9/32-inch drill bit. Place the back rest
     bar onto the seat pan. Screw the kit\'s bolts and lock washers through
     the bottom of the pan and into the back rest bar. Tighten the bolts with
     a 10 mm socket and a socket wrench.
     
     
     
   
   
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     5
     
     
     Lay the seat\'s foam next to the seat pan. Mark the
     approximate location of the back rest bar\'s protruding neck at the front
     of the seat onto the foam with a permanent marker. Cut a slit into the
     foam at the marked area, using a sharp knife. Place the foam over the
     seat pan and push the bar\'s neck through the foam\'s newly cut slit.
     
     
     
   
   
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     6
     
     
     Place the vinyl cover over the seat foam and pan. Pull the
     cover tight around the sides of the seat and staple it into place, using
     a heavy-duty staple gun. Cut a slit into the seat cover with a razor to
     allow the back rest bar\'s neck to extend outward. Remove the paper
     backing from the plastic boot included with the back rest kit. Slide the
     boot over the bar\'s neck and hold it firmly in place for 30 seconds.
     
     
     
   
   
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     7
     
     
     Reinstall the passenger seat on the motorcycle and tighten
     its bolt with a 10 mm socket. Place the back rest over the bar\'s neck on
     the passenger seat. Slip a bolt through the backrest\'s mounting holes
     and into the tube on the bar\'s neck. Loosely screw a nut onto the end of
     the bolt. Adjust the angle of the back rest, then tighten the bolt and
     nut using a 10 mm socket and a 10 mm wrench.
     
     
     
   
   

I successfully fixed this issue today on a 2008 dash stroller. first remove the handle, you will need to drill out the two rivets with a 1/4" drill bit, but don't go too far, don't drill out the plastic on the handle piece. unscrew the four brake cable clips. unscrew the two screws securing the grey release clips. Prop stroller on the handle bar side (put padding underneath so you don't mess up your work surface) and the rear wheels. now get two small bladed screw drivers, you can gradually pry down the internal plastic locking wedge on either side till it releases the front wheel section which folds down. (on the left side which is likely functioning, you can just pull the plastic circular piece down with your fingers, as the internal wire is still connected)
Now grab some vise grips, lock onto the locking wedge and remove the whole mechanism, also remove the foam inside with a screw driver (this likely is what was supposed to keep the tension wire in place). Take the locking wedge mechanism apart. ( you will need to push the steel pin out with a small screw, it does not take a lot of force) Get a small nylon zip tie and secure it around the shaft on the tension wire connecting end of the locking wedge. (this will keep it from ever falling out(pulling through) again. This part (the locking wedges) should have been made out of aluminum or stainless steel and the issue would never occur. You will need to trim the catch end of the zip tie and make sure that it can slide freely inside of the plastic sleeve. now slide off the nylon zip tie and set it aside along with the spring.
Take the circular plastic piece (the 4" part inside that is near the handle piece with slots in it) slide in the tension cable. Slide the other end of the tension cable into the frame from the handle bar side till you can reach the end from the front wheel side. Now slide on the tubular plastic wedge housing and lock it in place to the frame (the detente underneath the frame lines up with the bump on the tubular sleeve), then the spring, then the small nylon zip tie, then the release wedge. Secure the zip tie onto the release wedge shaft and aim the head of the zip tie down so it can slide freely. Put some Vaseline or white lithium grease on the release wedge so it slides well. If the release wedge binds up you will need trim the zip tie head a bit more so it fits.
Next take the removed riveted posts and drill them out with a sharp 1/8" drill bit about 3/8" deep. (Use vise grips to hold onto these guys, as they will get hot, and make sure to use some oil while you drill to keep things cooler. Slide down the plastic circularly plastic pieces (you may need small screw driver to manipulate them down) so you can re-attach the two grey release mechanism brackets.
Re-insert the two formerly riveted brackets through the frame which will locate the handlebar properly. Get two small 1/4" sheet metal screws. Put the black washer back on, apply firm pressure and screw in the 1/4" sheet metal screws into the drilled out posts with a drill.
Re-attach the seat and you are good as new.
Note: The instructions may seem a little tricky, but you can do it.

Make sure the chuck is loose then clamp the drill bit in the vice and give the drill a straight pull ,once its out then put some engine oil down the chuck and let it soak in ,not that fish oil spray stuff .

grip it with a good pair of pliers or vise grips and PULL. it will come out

If the jaws of the drill no longer works, then, the drill chuck must be replaced. Take it off by turning the chuck
counterclockwise, and putting an open wrench at its neck to lock it. Then, after taking it off, you can now have it replaced.

if there is a large spring around the top of bit area,Just pull the spring to the side and bit will slide out.I could be more detailed with brand, make,model or anything else to go on.

I hope I am understanding your question properly, if not, leave a comment. This drill *** a "keyless" chuck. If you look down into where the drill bit goes, there are metal pieces inside the black nose of the tool. Those metal parts are what holds the bit into place. The drill bit slides into the hole at the front of the drill (where it fell out from), Put the drill bit back in and then grasp the black tip (right below where you put the drill bit in). Directly underneath where you put your first hand, hold onto the piece directly below the upper part. Turn the top piece right and left and it tightens or loosens the mechanism that holds the bit in place. Give it a firm turn to make sure it is tight.

Have you pulled the collar to release the pressure on the steel balls. Just pull the collar usually forward and slide on the shaft and then release and twist till it locks. Let me know if I can help further