Edge pinker
Service Instructions 171/173 - 00.0 - 01/2020 55
3. Press the pedal back.
 The sewing foot is lifted.
The edge pinker (3) can be removed completely.
12.2 Changing the knives
To change the knives:
1. Disassemble the edge pinker ( p. 54).
Fig. 44: Changing the knives (1) 
Information
Take measurements A and B using a gage or another suitable tool.
Measurement A: approx. 2.8 mm
Measurement B: approx. 1.8 mm
 The new knives must later be set to the same measurement.