I've "fought" my wings onto the plane a couple of times so far using a combination of finese and "convincing" with a mallet. Then the change came out to trim the wing skins out to 3/16 vs. 1.8, made it better. Then I discovered that some "proud" rivets on the stub spars were catching on the fuse skins, so I radiused and/or stop drilled those spots on the fuse skins and shaved down the protruding rivet shop heads on the stub spars. Now with the gap seals installed it'll be time for "convincing" again i'm sure. Generally I try to avoid brute force under the theory that if a piece of Van's kit doesn't got together "like it grew there" then there must be something wrong that needs to be addressed to avoid breaking or distorting something. <deep breath> However, I'm kinda warming up to Don's tool with the eccentric lobe on it. I figure that using the screwdriver to turn the thing gives you a better tactile feel that things are coming into position smoothly (though maybe requiring some force) vs. having some parts come to a "hard stop" that you wouldn't be able to feel with the pipe expander. So Don, how must would one of those ingenious items cost? Don, ol' buddy? <grin>.