I've done it both ways with no problems. However it is important to remember the metal can be re-shaped by re-heating to 400 degrees. So, in that case I think I would suggest leaving the shaft and plate in place on the second one and on the first one I would re-heat and while it was hot (wearing thick gloves) I would re-insert the shaft and see if I could make it fit correctly. I would not re-bore it. Sorry to hear you had this problem.
