Need some clever tips on this still...

Any other good ideas to make sure the drill goes through straight with a 2 screw standard control horn?

Drill press is no good when the surfaces are already glued and hinged on the plane.

Also when the horn is up against the fuse closely what type of long drill bit or tool to use to make the hole since the bulky electric drill forces an angle since it can't get close to the plane?

I usually miss getting the holes straight enough to line up with the backplate 50% of the time lately...