I started with blue loc tite on a brand new pinion and grub after the pinion came off the first time, then I went with red loc tite and 2 grub screws on another brand new pinion when the pinion came off the 2nd time. It set for 24+ hours, then I meshed and did loc tite on the motor mount screws as well. Let that sit for 36 hours. The run today lasted 1 minute at half speed and the pinion was off again??? What could I possibly be doing wrong? I even put loc tite on the motor shaft in the pinion, the grub is on the flat side, what do I try now? I made sure the grubs were exiting the pinion into the center chamber fine before I put them on. Suggestions please.