Panasonic SA-AK220GCP Service Manual page 31

Step 5 Remove the flywheel R.
Step 6 Release the claw of tape side, and then remove the
winding lever and spring.
Step 7 Remove the flywheel F.
[Installation of the belt]
Step 1 The boss and marking should be positioned
horizontally.
Step 2 Put the winding belt on the pulley temporarily.
Step 3 Install the flywheel F.
Step 4 Put the winding belt on the flywheel F.
Step 5 Install the winding lever and spring while pressing the
winding arm in the direction of arrow.
Step 6 Install the flywheel R.
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SA-AK220GCP