Thanks for the heads up, sorry to hear about the crash but it's an easy fix.
Just find the part online with a dealer close by and you'll have the parts in a couple days.

As far as the allen screw there is only one that secures the tail rotor shaft.
Are you talking about the balls that connect the tail slider to the grips?
If so, those go into plastic so locktite is not an option.
I'm tightening mine now.