Hi,

I can't claim any originality for the following system it was passed on to me by a great scale builder who regretfully is no longer with us, but I still use many of his tips and suggestions.

What works for me is to use a guide. I have some old broken timber engine bearer that I first used the drill press to accurately drill holes through that are the same pattern/dimensions as the control horn and base plate. I do taper the start of the screws to a fine point on the bench grinder first.

I then place the guide over the control surface and use my cordless drill with a bit smaller than the diameter of the screws and the horn and backing plate holes align. Then put a couple of drops of thin CA in the holes and when dry screw on the horns. This method is much quicker than using the drill press for every surface and just as accurate with the guide.

Cheers,

Colin