Pertronix ignition kit

[rddaves54]

I have Pertronix ignition kit (1181) and was wondering about the measurements they provide. I have the measurements correct when the distributor is down but when I push it up like they say the measurement calls for shims that they provide. The gap cannot go over .060 and mine does when the distributor is pushed up. I have to take the bottom gear off to put in the shims.

Two questions. First is it that important for the measurement to be that precise?
If so how is the bottom gear taken off. Do I remove the pin and then use a gear puller?

I put a Pertronix in my 64 Corvair 6cylinder and did not have to do all this measuring.