Wecome Michigander!
1. No canon pinion fix
2.engraved
3. apparently Josh does inspect/ do QC before sending them to u. Pretty reliable, of course u will have exceptions! but he is easy to deal with. Will even replace them if u have an issue.
4. U can email Josh, his email id is in the dealers list on this website.

I am a newbie too, tried to answer my best.
Hopefully some senior poster pithces in too.