9XL & Mamba Max Shut down!

[glassdoctor]

Maybe you can convince him to swap batteries with you, hee hee....

Sounds to me like you should be good.... except for the pinion issue.

You could try red loctite, if you have been using blue...
Or maybe use some JB weld around the grub screw, as if you were making the pinion thicker. This will give the screw a little extra something to bite, and act kinda like a locknut. Just a little mound of it surrounding the screw...

Maybe this is too obvious, but can you get the screw any tighter without stripping it out?