Timing Gear Drive

>reason I ask is that the gear is a tight fit on the crank.
I dont want to have to keep pressing it on and pulling it off.

On mine the first couple tries the gear was very tight going on/off. I pulled the key and filed just a little bit on the flats and corners and reinstalled it. Went much easier, but my key is about 53 years old and who knows many times it has been apart. That made things easier what with many trial fittings. I will use a new key on final assembly.