Reference 15 Clones:
Is there a rule of thumb, or a ball park setting for the distance the needle bar rises after BDC, when the hook point is centered behind the needle?
And is there a rule of thumb, or a ball park setting for the needle depth at BDC?
I've got several clones, over a half dozen, and they are not the same. Some work good and some are cranky, but no two are exactly the same.
Some have timing marks and some don't. But even with those that have timing marks, when the timing marks are lined up the needle points are not in the same place relative to the hook point.