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Hi all,I have a major issue with my singer class 7 double needle oscillating shuttle hooks,and thread , At the moment I am only using the left side needle trying to sort out one side first,on this twin needle singer class 7 machine. It does not matter what needle and thread combination I use the same issues occurs, seams to stitch for longer in thicker leather and worse in thinner leather, issues in thinner leather happens after 4-5 stitches issues with thicker leather can occur as soon as 10-30 stitches`s, I start stitching `then I will notice as its stitching the thread looks like it wants to twist more in the leather, and when the needle is travelling up and left the leather the thread looks like its twisting and some times fraying some time both together, but the twisting seams to happen a few stitches first before fraying. then it may fray it may not. if I carry on two or three more stitches the twist will get worse and go as far as the thread pick up leaver as shown in the picture, Some times the hand wheel will not move` stuck firm, where the thread had got trapped underneath when all stitches top look good and no sign of twisting above, but when looking underneath where the thread had tried to leave the back end of the hook ,its gotten trapped, other times there has been a double loop occurred or where the hook for some reason won`t go around to finish the cycle , because when I cannot pull the leather away with out cutting the thread,then I noticed the second loop not completed, The whole machine has been cleaned up all the shuttle hooks and the race and needle plate and all the run ways where thread passes all good and all the tension discs have been cleaned polished and checked , the needle thread guide by the needle no longer has thread cuts into it ,needle is set at correct height and distance from hook, and checked for sharp area on the shuttle hooks that may cut the thread has been checked.its all been well oiled , needles have been replaced with new, thread been changed to other types as well , but the issues still posits every time I sew, The last time it got snagged I cut the thread removed the leather removed items up above to inspect what had gone wrong on this particular moment. This time the thread had gotten (inside the hook) made its way to the spring as shown in the pics and the spring had come out of its hole laying as shown, I do not know how or whats happening causing the thread to get where it got to, Im thinking as the stitches look good surely it is not a tension issue , I have also threaded the machine several different paths just to see if it stopped the issue but it never , I Don`t know if the bobbin case may be moving slightly while in the hook assembly causing the thread to be snagging on the case as it slides over it, or to muck rocking back and forth with the hook in the race whether its moving faster or slower causing it to trap the thread, or is the bobbin thread tension to tight or to loose, or is there wear that the shuttle hook has to much movement from side to side as it goes around, but it feels good snug,or some how is the timing out, I am at the end of my options to why this keeps happening,and why they would make the shuttle with the gap partially so far and not have it as a complete hook going all the way around the bobbin case,like iv seen on the majority , I also made many types of tension springs for the front plate but this never changed the out come either ,so in the end I just tied it up to stop it moving so much, out of frustration,but on the pick before un threading you can see the twisting going up towards the thread take up