I have found that my 1 3/16 3/4 inch drive socket works perfectly for removing the bushings from the HG track rollers and the front wheel hub. The small end will push the bushing part way out, then by reversing the socket the bushing can be pushed on out. This may work on the OC3 and others.
This is easier than cutting them out with a chisel as advised by the instruction manual.
Tomorrow I will see if it will work to push the new bushings in.