It's not really a huge project. It's a huge annoyance. Squirt it with PBblaster and try it today. Then squirt it again tomorrow and try it. It's just a delay in your time frame. Besides, you were going to need those tools and penetrating oil for the White Rotary, anyway.
The 15-91 is a great machine. It's almost as smooth as a 201-2. And you can FMQ on it to boot! It's worth it.
bkay