Rebuilding Calipers The Easy Way!
 

Frustrated with busting my knuckles trying to clean some gunk out of my calipers by hand with crocus cloth, I searched for the lazy man's way and came up with this method. It works great, takes seconds instead of hours, only costs a couple of bucks. Most home wrenches will already have the stuff

You need a 2" fine grit flapper wheel, a 1/4" flat head screw and nut, a low profile 1/4" air ratchet with a 7/16 socket.

Insert the assembled flapper wheel inside the caliper and use the nut to spin it with. If you rock it back and forth, you can actually get a cross hatch pattern. Make sure you really flush your calipers afterwards or you can hook an air line to the line and bleeder and have air pressure during the entire process to prevent intrusion.
http://www.sayegh.org/Paul/porschepics/caliperfix1.JPG

http://www.sayegh.org/Paul/porschepics/caliperfix2.JPG
http://www.sayegh.org/Paul/porschepics/caliperfix3.JPG

Looks like a nice idea, especially if you have some rust in there. I imagine you might have to take care not to make the hole a little out of round.

where did you get the 2" fine grit flapper wheel?
Thanks

Any industrial supply place would have them and maybe even Home Depot.

You can also use dowel rods of different sizes and sheet emery cloth or sandpaper of various grits to make your own flappers that you can chuck in a drill. That was a trick my dad used to do, and we used that method in rebuilding my 356's wheel cylinders and master cylinder.

Brian