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Remove 4 screws that hold starter to housing, remove handle by cutting rope, notice how rope is wound and mark arrow on spool for direction, from drawing looks like there is a compression ring holding the spool in place, let tension of spring by allowing spool to unwind, Remove this ring very carefully to prevent damage. Remove spool carefully and let spring stay in starter housing. Rewind rope install in starter housing install compression ring wind cord in spool three turns pull through rope eyelet and install handle.
There are screws holding the top housing onto the machine. (The top housing is where the spool pin slid into). remove the screws on the top housing and pull the top housing up off of the machine. You will be able to reposition the spool pin to where it supposed to be. put the top housing back on and reinstall the screws.
there should be screws in the corners/middle at the back of the head. Phillips/torx head, once they are removed,you can separate the housing and then you will need to wind the the spool counter-clockwise, note the cord is not attached, once you believe you have wound the spool enough, you will need to feed the cord through, tie a knot, burn the end and the let go of the spool and it will retract the cord, pull a couple of times to make sure the knot is holding, then reassemble and start weed eating. Good Luck Tim
found this on a web site should tell you what you need to know
I removed the screws from the bottom of the unit to separate mechanism that held the blades from the engine. This revealed a clutch on the end of the drive shaft. I removed the springs so I could remove the two halves of the centrifical clutch. I did this so I could then remove the mount these two halves were around. This mount had an arrow and the word 'off' on it. I placed a block of wood against this mount and hit the wood (protecting the mount) as to spin off the mount in the direction of the arrow. A few sharp licks with the hammer and the mount started to come off. I removed it by hand then. Next I removed screws and spark plug so I could get the green housing off where the cord was mounted. Inside this housing is a white spool the cord was on. Becareful with the next step. To replace the cord I removed the spool the cord is wound on but be careful, under the spool is a metal housing under which is the spring that rewinds the cord when you pull start the unit. The end of the white spool that is out of your sight meshes with the end rewind spring. If you pull too far up on the spring or the metal housing that keeps the spring in place you will have spring everywhere and possibly toward your face becareful. So Loosen the two screws and turn the tabs out of the way that hold down the white cord spool. Slowly work the white cord spool off. Replace the cord on the spool making sure you wind it in the proper direction. Then replace the spool and mesh it with the spring. Turn the spool to wind the spring and retention the pull cord rewinding spring. re assemble unit. Good luck! This is not a step by step but I believe it will get you what you need.
Would have to assume by now you figured this out. However, need to open up the handle. It is a clamshell arrangement. Remove switch from handle, pull one wire at a time from the switch. The electrical connectors are a push-on type. Replace each one, one at a time, to the new switch, and then re-insert switch into handle. Close up the clamshell, tightening all of the screws, but do not strip the plastic housing.
These are the steps to open the clamshell/motor housing for the Black and Decker 18V Cordless Trimmer Model NST2018. The orange clamshell has two plastic clips that engage two recesses inside the black plastic ring. You use two screwdrivers to disengage the clips and seperate the black plastic ring from the orange clamshell. Follow these steps: Wrap tube assembly in a small towel and mount in a large bench vice securely. You will notice two small openings at the top of the black plastic ring at the top of the orange clamshell. The next steps require two people. Person one inserts a flat-bladed screwdriver into into each of the small openings at the top of the black plastic ring (two screwdrivers). Using the tube assembly for leverage, pry the black plastic ring from the orange clamshell with enough force to disengage the orange plastic clips from the black plastic ring. Person two pulls the orange clamshell/motor housing away from the black plastic ring/tube assembly along a straight line (same axis as the tube assembly). After you've separated the motor/clamshell housing from the black plastic ring, remove the six screws and open the clamshells.
You could have a very small crack in the main circuit board. To find this you'd have to pull the board and flex it slightly and/or use an insulated and non conducting object such as a plastic rod and tap the board all over until you find a sensitive place. You have to do this with the set turned on.
If you're not experienced at this type of trouble shooting, you need to get a qualified tech to do it for you. These sets usually require the use of an isolation transformer to protect you for being shocked. Also you need to know how to work around high voltage circuits. There's several thousand volts on your picture tube. Also you need to make sure you don't cause a short when the board is out of it's holder and in operation. Be careful !