I have a 74 everest that I need to check out, I haven't had the clutch off yet. To get the hex clutch off my Cats, I took a 1/2" NF bolt, cut the head off to the right length, cut a slot in it to use a screwdriver in, threaded that into the crank (1/2"+) and threaded a 9/16" NF bolt into the threads in the clutch to push against it all. Everything is different, I'd guess Doo's are metric, but I've used 9/16", 5/8", 3/4", and 7/8" to pull AC clutches off.
'89 Wildcat 650
'93 Jag Delux 440