Michael, HA! You're correct about the fan motor changing procedure -- but you youngsters have it easy with your late model 240s :-) Back in the "old days" when the 240 had the exposed winding motors the replacement motors with a full housing cover were too big to fit the space. You had to go in with a grinder bit in a drill and ream out the plastic matrix housing. When you got finished you could figure on another hour vacuuming and blowing plastic bits out of the interior. Fun.
The one "trick" to save time would be to leave the outer r/s cover in place and use a hole saw to gain access to the fan blade locking "washer/clip". A long thin screwdriver with a clip hanging on it makes it fairly easy to align the fan with the new motor's r/s shaft and get the clip secured. Duct tape takes care of the hole. -- Dave