Those bronze bushes are a bloody tight fit, and are hard to remove because the hole up through the middle of the housing isn't much bigger then the bore of the bush.
With the housing out, I screw a 9/16" UNF tap into it then use a 1/2" drift to drive the tap + bush out. But I doubt you could do this in the car.
Then, how to fit the new one, they are normally drive in fit...
You could put a 1/2" bolt or stud up through it, fit a nut & washer then tighten to pull the bush in.
Good luck.
BTW if you buy a 1/2" ID x 3/4" OD x 2" long bronze bush from a bearing shop and cut it in half to make 2 bushes, these are a better fit on the shaft than the regular Mini ones. And 1/2 the price, too.
_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
