I know with the Fireball rods you can use some 3000 grit sandpaper to smooth out the QPQ surface on the rods. Gently, gently.
Another, more risky solution is to remove a small amount of plastic material on the inner bearing surface. If you have the old bearings still, it might be worth a try. The idea is to increase the inner bearing dimension just enough to improve the rod travel. If you take too much off, you will affect playability because the rod will feel loosey goosey.
The way to do it with a Fireball split bearing is to take a foosball rod, wrap a heavy grit sandpaper around it, and then work it back and forth a little. Don't know if you could do this with a Shelti bearing.