A PS on my instructions: Threaded part of the shaft is surprisingly soft...DO keep the nut on the shaft right at the top. I actually collapsed the threaded area on a '32 once, which of course still gives me screaming nightmares and flashbacks.
If there is a horn wire you can fold the terminal eye a bit (this is '40-48 info) and push it down the tube a short ways.
Then, drop a bolt whose thread diameter is close to ID of shaft into the hole so it supports the puller ram, which otherwise would be trying to spread the shaft. I drill a small pit into the bolt head to center the point of the ram.