904 extention housing bushing

You can also take a hacksaw blade by hand, cut it length wise and bend it out.

Also it helps if you put the extension housing in the oven, and the bushing in the freezer for 30 minutes before the procedure, as the install is what they call "interference fit".

Use plenty of lube going back in, and use a 2x4 between the bushing and your hammer as you drive it in.

Have a blast!