It is easy to do without any fancy tools. Go for it. All you'll need is a Dremel to grind the end of the factory pin that holds the gear to the shaft (replaced with a tension pin from the hardware store), a punch to drive the pin out, screwdrivers, pliers and wrenches.
There aren't any bearings in it. The distributor case acts like a long bushing for the inner shaft to fit through.
There is good info about how to do it at Deve's website--devetechnet.com. Look under the '59 235 rebuild and you will find instructions how to tear one down and do a rebuild. My 1957 shop manual also had great step by step instructions.
Simple and fun. If you have a good core to start with, you'll probably be happier (and prouder) of your rebuild than the repop you bought.
Good luck,
Matt
