Schwinn 170 Service Manual page 26

4. Thread the Crank Puller into the Crank Arm (B). When the Crank
Puller is in the correct position, only 1-2 threads on the outer portion (CP2)
of the Crank Puller should show.
Note:
with the Nut (CP2) as shown, before use.
5. Using a wrench, turn the inner portion (CP3) of the Crank Puller
clockwise. The Crank Arm (B) will slide off as it is tightened.
CP1
26
CP2 CP3
CP2
CP3
B