So, I've cleaned and oiled the shuttle, measured hook timing, needle height and feed dog height, etc, all to specs. Everything is wicking oil (a little too much down the needle) and it's still well greased.
It sews just fine. Except....
Presser foot won't lift till it's set at about 3 or so, needs to be at about 6 to actually lift enough to move the leather. And stitch length needs to be above 3 or so to even separate the holes. Set on 8 makes a 4.5mm length. Was almost exact to the setting till the clutch tripped. So something has moved. No evidence of teeth broken and no metal bits floating around, and everything is tight.
Been studying all the linkages and movements, and the books and diagrams, but still not confident enough to start loosening screws until I know exactly what moved? And why?
So can anyone help? Maybe a photo pointing out what to adjust?