Everyone,

Thanks for all of the great replies! They were extremely helpful. I resolved the problem in the following manner:

I purchased a dremel drill press (awesome little accessory for anyone who owns a dremel!). I put a 1/4" piece of wood-stock underneath the trailing edge of the aileron. By holding the aileron flat on the drill-press surface and moving the wood stock backwards and forwards, I was able to get the 90 degree drilling angle required. After I found the ideal place for the wood-stock to go, I taped it into place. The holes are straight and at exact 90 degree angles. Again - to everyone - thanks for all of your help!!