When it came to refitting the swing arm, I inserted a long threaded 3/8" rod through the other pair of holes in the plates the swingarm attaches to. I used a pair of leather washers for padding against the plates, thick flat steel washers, and nuts threaded on the rod on the inner sides of the plates, and as the nuts were turned counterclockwise, it acted as a spreader to slightly widen the frame just enough to slip the swingarm in place with no harm to the paint.