I am getting close to having to drill the holes and cut the groove for my elevator control rod on my Sig Hog Bipe. I have done a search looking for any tips on how to drill the hole and cut the groove without breaking through the balsa on either the top or bottom. On my Sometin Extra it was a little easier because the elevator was not done with angled stock. If anyone has a tip on how to do this process or if there is a thread that shows it I would appreciate any feedback you might have.

BTW: I have thought about buying the groove cutter tool, but not sure if it is worth it.