Hello Everyone   I have got a Pfaff 145 H2 for a few days to try out. It has some problems I should like to see if I can fix by myself. The stitch is changing all the time adjusting the bobbin or upper thread tension does not help. Turning by hand gives a little better stitching. Using reverse after a couple of turns the machine blocks. The hook timing seems to be ok. Using the motor it gets worse: The stitch length adjusting lever starts vibrating and the