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Hi and welcome to just answer.
Did you try to replace your needle?
Hi Chester, yes I did. I was using a twin needle when the trouble started. I have since cleaned the bobbin area, changed to a single needle and re-threaded the bobbin and machine.
The point passes the needle about 3mm above the eye but it might be slightly more. Very difficult to judge though. I am not quite sure what you mean by the needle bar. I have already removed the metal plate to see the alignment of the needle and hook. Is the screw you are talking about the one behind where you screw in the needle? Incidentally the automatic needle threader works ok. When I looked at the needle and hook, the needle did seem to be very close to the semi circular plate on the metal cylinder which has the hooked part on it. I hope that makes sense.
This plastic part has the handle attached to it and I can only see one screw underneath where the handle lifts up. This all seems very complicated and I cannot see how this needle bar could suddenly drop. The machine was working OK and then just started jamming up. Yesterday I was doing ordinary sewing and twin needle sewing OK. Is there no other answer?
It is not clear which screw to turn, It would seem to be one behind a black plastic part which makes it difficult to get a screwdriver in. I don't think we can do this.
That is easy, use sharp or pointed metal to snap off the black plastic cover then remove the screw.
Others things you need to try before considering timing issue. Try to insert your needle with a little bit down low (do not insert all the way up) just give little allowance going down.
Also try to adjust your tension and see if there is any improvement.
If you are not comfortable doing technical job I would suggest you to send your machine to repair shop to re-timing your machine.
Hope this information will be helpful.
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The part I referred to is black metal not plastic (sorry I was wrong) and is a shaped piece in front of the screw not covering the screw. If I lower the needle the distance to the hook will be greater than 3mm not less.
I have removed the cover! You do not understand, it is the needle bar adjustment screw that is difficult to get to or even to know which it is.
You still don't understand, I can see the bar but it is not possible to get at the screws because of a black curved metal piece in front.
This matter is still unresolved. I wish to cancel the dialogue and re-claim my deposit. How do I do this?
I wrote to you on Friday and again on Saturday but I have heard nothing back. My money has been taken from the bank but my problem is not resolved. I cannot access the screw you mentioned and even if I could we do not know yet if it will resolve the problem. Your comment about lowering the needle was ridiculous because that would, if anything, make the problem worse. I can find nowhere on the website to cancel this dialogue and recoup my money.