Two discrete issues mentioned here:
First, trim that hinge pin so it doesn't touch the aileron bracket. Mine is trimmed such that it doesn't protrude through the brackets at all, so no touching. The hinge pin is not supposed to be used as a control stop.
Secondly, you install a control stop separately for the aileron, either by following the instructions with a small piece of angle riveted to the bracket or as Mickey did, using a nylon spacer which you can get from many places. I did the same as Mickey and got the perfect sized spacer from McMaster-Carr. You have to install a small bit of aluminum tube inside the nylon spacer as a protective bushing. I find it works very well.
RV-8 #81077 Super Slow Build
Titan IOX-370, Dual P-Mags, AFP FM200A FI, Whirlwind 200RV CS Prop
First Flight 11/20/2016