My most recent build came with a motor retainer that uses a snap ring to hold the motor in place. The snap ring that came with it does not have the 2 holes snap rings normally have. It was very difficult getting it in and I have yet to get it out (will try more). I will probably just order some normal snap rings that I can insert and remove using my snap ring pliers. Anybody had any experience with the snap ring that came with the kit?