Use Clock repair cutting broaches to ream out a pivot hole to accept a bushing. Ream the hole a bit larger so that a new round bushing can be out in via friction fit. Also use it to increase a bushing hole diameter as well.
Comes in two different size sets. Sold as a 10 pc set with these sizes 0.90mm to 4.00mm and 4 1/2 inches in length. These are the sizes most needed for most clocks, with the exception of winding arbor holes.