Fein Slugger HoleMaker III Instruction Manual page 21

Adjusting the stroke range
(figure 11).
Hold the machine firmly
CAUTION
with one hand by the drill
motor when loosening the two fastening
screws.
Loosen both fastening screws using a hex
key.
Adjust the desired stroke range.
Tighten both fastening screws again.
Fig. 11
6 mm
4.
4.
6 mm
3.
1.
en
2.
2.
1.
2.
4.
2.
4.
21
3.