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Be sure to unscrew the set-screw and extra turn and then insure you are pushing the needle all the way up before tightening it. Could also mean the set screw is stripped...
Consult your owner's manual to confirm which way the flat side of the needle should face in your machine (machines differ, but most have the flat side facing the back.)
Make sure you are loosening the needle screw sufficiently so the needle will fit all the way up into the clamp. Then tighten the screw. If it does not hold, then perhaps the screw has been stripped and you will need to take it for repair.
It sounds like you have lost the tread guide. When you press the clamp as far up as it will go, there should be a slot in the post underneath the clamp visible. You may need to use a mirror to see it. The thread guide snaps into that slot and keeps the clamp from falling down. Take it to any repair shop. It will not be expensive to repair.
Each needle has a small set screw holding it in place. Just above the needle from the front you can loosen the needle by using a T6 (Tork 6) screw driver (if you don't have the original tool that came with the serger) to loosen the needle. Before loosing the screw, I would put a piece of fabric or paper over the needle plate to catch the needle (or part) to keep it from falling in the machine. Turn the screw counter clockwise (to the left) to loosen. Insert the new needle and tighten. It's not necessary to remove the screw entirely, just loosen it and the needle usually just falls out.
it sounds like the screw is stripped out or the needle holder has a problem on the left side, it would be a good idea to have the needle holder checked.
the best thing would be to take the machine to a sewing machine shop & have them check to see what's wrong with the needle holder, cause if there's a something broken it will have to be replaced
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