Pfaff 571 Instruction Manual page 57

Adjust hook post according to Requirement 1 and tighten screws 4.
Making sure that there is some play in the bevel gear, tighten screws 2.
With retaining collar 7 touching bevel gear 8 tighten screws 1.
Adjust needle guard 6 (screw 9) according to requirement 3.
When the hook is changed, make sure
that the markings 10 and 11 are both
on one side.
Adjustment
10
11
11 - 11