When I was buttoning up the leading edges, I didn't take enough time to massage the skins to fit perfectly flush which ended up with a small pillowing between two rivets. It wasn't bad (maybe 1/16") but it was annoying me, so I threw another rivet in for good measure.
In the midst of working on the counter weights I snapped a few pictures of the method I used to trim them down. I started out with a file as others have done but figured there had to be a quicker method. Here's what I came up with: