It's very easy to work out what happened...
when the pinion came adrift, was the grub screw still glued in with loctite??? Or was it loose and easy to re tension with hand tools
Because using red locktite that grub screw should of been stuck... To the point that with no heat a hex driver would simply strip and round if u tried to remove it.
im suspect that there is a issue with how much loctite u are using, strength, and it's cure times
using red locktite is not the smartest idea, u might want to re thing that. Otherwise down the track u might have issues removing it.