ORIGINAL: frequent flyer
I have a number of pine 1 x 4 blocks the are a foot long, from these blocks I made two vertical pieces of 1/16'' piano wire that I sharpened the ends. I glued these into the blocks with the points sticking up. When I paint a control surface I just press it on the two wires guiding them into a couple if the hinge holes. It works great and I put tape on the hinges that I usually epoxy into one have before painting.
I used to do something very similar but due to my lack of being a great painter i always ended up with an off color due to more paint on let's same an elevator than the horizontal stabilizer. Attaching them in close proximity of each solved that problem and now the surfaces are much more consistent with each other.