On Sunday after cutting out the pieces for my Burda jacket I prepared to overlock all the edges as the boucle was shredding madly all over the place.
The needle on my Janome overlocker needed changing since I had used it to make my husband's fleece jacket so I started to undo the screw to release the right needle. In a lack of concentration I absentmindedly undid the screw on the right side of the needle bar instead of the one on the front. Thinking all the while "I don't remember it being so hard to change a needle before". As soon as I had undone it I realised my error. Then I had a terrible time trying to get it back in place.
That was just the start of my problems! For three days I threaded and re-threaded my overlocker, but no matter what I did my machine skipped stitches or refused to make a chain at all. I changed the needle again in the right place this time and loosened the wrong screw and re-tightened it. I googled, but no one seemed to have my problem. I did everything I could think of, to no avail.
Finally I gave up and this morning I took it to my local Janome dealer for a repair and service. When I explained the problem the lady said knowingly "Oh you've put the timing out."
I can't show a photo of the screw concerned as my overlocker is in hospital, but it is on the right hand side of the little metal square that the needle screws are in and holds the square onto the needle bar.
So be warned!
Don't ever touch it!