How does one go about removing simplex crank arms, I have a 70's model Peugot... I removed the small bolts on the underside of the crank arms near the spindle. Also, there is a plastic piece in the area where one would normally use a crank-arm puller... which I cannot seem to remove...

Any advice... I would ultimatly like to use these cranks again, so I don't want to damage them...

Any advice would be much appreciated.

Thank you.