Chevyboy, I used a standard puller to remove the stock balancer from my 235 in the '61. Was no big deal. I replaced it with a balancer from a later 250. Took both balancers to a machine shop where they measured and cut the snout off the old balancer to make a spacer for the newer one. This gave me the extra pulley positions I'll need to run the PS pump and AC compressor. I put it back on by using light taps from a hammer cushioned by a one foot length of 2X4. Just tap it on until the snout bottoms out against the timing gear inside. I did drill and tap the end of the crank while I was at it as well. Extra insurance against it coming off in the future. There are plenty of different opinions on the re-install issue expressed in other posts here. HTH