I needed the scew that holds the needle tenion on holds a spring and 2 metal parts on

I think you should consider a little oil if it's metal parts - it is a small spring that holds the needle in place

I'm not exactly familiar with your machine but... a few things you should know. 1. You need a metallic thread Needle. or at least one with a larger hole. 2. Check your bobbin carrier, if anything catches or jams between between the spring and the case it can loosen the bobbin tension and make the top show too much bobbin color. 3. If your bobbin spring becomes grooved from the wear of the thread... same thing. 4. If your spring and everything is ok and clean... tighten the tiny screws to tighten the bobbin tension some.

Go to www.searspartsdirect.com and you can get a complete breakdown diagram by entering you machine model. It will tell you the name of the part and ordering number.

The reason of this missbehave is a destroyed plastic buffer, which is attached to the move limiter for the needle bar frame. It is quite a little delicate to open the machine's housing due to some hidden scews. Neccesary is to open it. You have to empty the accesory drawer. Then you have to remove the underside cover. The right side cover must be removed as well (take care of the screw which fixes the middle part of this. It is found from below through a small channel, just fitting a screw driver through the hole). Below the movable small table at the lower left front, there is a small turnknob for adjusting the horizontal alignment of big patterns. This knob has to be pulled out, also the round cover below it (best use a little hook and pull the cover out at its small hole seen from below). Remove the two screws directly under the movable table. Remove all screws, which are fixing the front cover from below the machine. Remove the hood which covers the needle bar just as you would like to change the light bulb). There are two scews to be removed holding the front cover. The foot presser handle has to be removed as well. Now gently pull the front cover off the machine. It might be neccesary to help moving the cover at the upper side, inserting a screw drivers blade into the gap between cover and machine frame. The cover should snap off now, if there are no forgotten screw connections left.
After the cover is released, take care of the ribbon cable, wich connects the display etc. with the electronich mainboard. the ribbon cable can be teared out carefully of the mainboard connector. Now you have clear sight onto the needle bar's mechanics. if you push the needle bar to the right, you can see, that the needle bar frame is stopped from a small metal piece, fixed with two screws. At the touch point of the frame and the metal piece, there is (or was) the plastic buffer, which is now destroyed and has the consistence of used chewing gum.
There are two choices: Either you find a spare part metal piece with good plastic buffer or you will have to improvise the buffer by handcrafting it.
After you repaired the metal piece, you will have to adjust it.
Moving the needle bar to the right, the needle bar clutch have to release the needle bar before the needle is over the point to stitch to the plate.

Remark: Due to the different length of the screws it might be a good idea to give some notes, which length belong to which hole.

Wish a good success,

Bernd

1.) Remove the screw that holds the needle in. Remove needle.

2.) Gentle pry the thread guide clip off of the needle holder. There is a guide and a small flat spring, do not loose those.

3.) Remove the needle height pin. These pins are available in several different sizes and need to be set correctly.

4.) Remove the holder assembly.

5.) Reverse procedure to assemble with the new needle holder.

This really should be done by a Bernina dealer that has the proper parts.

I’m happy to assist further over the phone at https://www.6ya.com/expert/gary_ff3d95e2d75b6cc9

Sorry, what are you asking ?

this sounds like the needle guard it is usually held on by the same screw that holds the needle clamp it should fit so that it comes across the needle at the front to stop your fingers being sown but not interfere with the needle try turning by hand before turning back on.

Update:  Today I took my machine in to get serviced - they replaced the metal bobbin I was using with a plastic one, that was a little less rattley inside the bobbin case, replaced the needle with a new, universal one, and changed out the thread with something a little higher quality.  They also adjusted the spring holding the bobbin case slightly, and now it seems to work fine.  I'm not sure how long it will last, but for now I'm good.  

if you put a number in your picture like this
1 2 3 4
5 6 7 8
9 10 11 12

Its easy but you must do it exactly like what i say
A - put (1) into the handle so that the pitch goes in to the gear of the handle -make sure that (1) goes in to the handle like this shape 9
after instalation of this "check spring" , u need to bend twist it clockwise little bit so that u improvise the spring in its place (approximately 45 degree)
from now u need to hold the (1) with something so that doesnt move (screw driver or long needle )
B - (12) while u hold the "check spring" with needle , u need to open up its legs so that number (12) which is callled thread controler ( because im not familiar with terms so i explain- haha - it has two Rod, small and large Rod) small rod must go into the hole

c - (10) while u hold the "check spring" with needle , u need to open up its legs so that number (10) it goes through the handle - make sure its top hole goes into the black rod which comes out of the sweing machine - note that u must embed it in the manner that bigger peripheral put in the right hand side.

d - (5) while u hold the "check spring" with needle , u need to open up its legs so that number (5disk) goes through the handle
e - (6) while u hold the "check spring" with needle , u need to open up its legs so that number (6disk) goes through the handle
f - (11) while u hold the "check spring" with needle , u need to open up its legs so that number (11) goes through the handle
g - (9) while u hold the "check spring" with needle , u need to open up its legs so that number (9) goes through the handle - make sure its top half circle hole goes through the black rod which came out from the sewing machine.
h - (7) here you dont need to open the check spring needle . so release its leg and put the plastic male into the handle while males go in to the hole of (9)
I - (2)
J - (3)
K - (8)
ll - (4)
Done. Great Is The Lord

Totally happened to me last week. I discovered that the metal piece that fell off and holds the needle has a small screw that holds it in place. It needs an Allen wrench (tiny one) to tighten it back into place. I just lucked into figuring it out.