Good Tips and Information!
Well stated! I used some of your information to get the first unit assembled. Thanks for the tips.
I did use the largest pin to break the gear loose from the shaft. After that it just came of easily.
I pushed the small pinion gear onto the shaft. I was worried that it didn't seat on as far as the previous gear, but it was on as far as it wanted to go. I began to assemble the various parts of the GB and found that things just slipped together.
I connected a battery to the motor and away it spun.
After a while the two black pieces came apart, so I used black electrical tape to keep it together. The kit has blue tape supplied for this purpose.