Morgan - my wiper was doing the same thing. I found a few posts showing how to rebuild, including this one by Denny.

https://www.stovebolt.com/ubbthread...Main=122331&Number=832261#Post832261

And a link to his photos here:

http://www.pbase.com/dennygraham/spare_tyco_vacuum_motor&page=all

Of course I didn't refab all the parts that Denny does so wonderfully, but I just cleaned the paddle, relubed it. And put it back together using a thin layer of gasket maker between the 2 halves.

Can't hurt to try.

Mark