Using the reamer is a good idea. I like to try for a slight press fit of a shouldered bolt in a hole, maybe .0005"- .001" or so when I'm replacing rivets. Install the bolt with an air hammer, and just use the nut on the back side to secure it in place once it's bottomed out. Never, ever, let the threaded area of a bolt replace a rivet; the part that passes through the joined pieces MUST have a solid shank. Since the spring perches and other parts riveted to a frame were either hot-riveted or at least installed with a big hydraulic press, any clearance at all in a bolted assembly will only get worse. A properly-installed rivet is as close to a piece of solid metal or a weld as is physically possible. That's why areas of airplanes that carry flight stresses are riveted, not bolted together.
Jerry
