I got my plane second hand and removed the counterweights because the first builder hadn't painted the flaperon skins underneath the counterweights. That is really asking for trouble with corrosion. After painting both parts I put them back on with rivets and Hysol.

FYI I used solid aircraft rivets on the trailing edge of the flaperons, including the counterweights. This is super easy to do if you have a rivet squeezer.