Pfaff 1425 Instruction Manual page 49

Set needle bar at 2 mm past b.d.c. (use screw clamp and needle-rise gauge).
Set hook point at "needle centre" and tighten screws 4.
If necessary, readjust needle bar according to Requirement 2.
Remove hook base and turn eccentric 6 (screw 7) according to Requirement 3.
On the PFAFF 1426, also loosen screws 1, 2, 3 and 4 on the second hook and
carry out the adjustments as described.
Adjustment
11 - 13