Adler 67 GK 373 Hook Timing (Kőrforgó beállítás)

Adjusting the rotation of the ADLER 67 GK 373 rotary hook. Can be used to adjust almost all lying swivel clamps. For example: PFAFF 142, 145, 542, 545, etc., etc. The difference is that the PFAFF types have the smaller gear which is adjustable. It's on the large flat.