Wiper Motor Restoration

There is a site on Ebay that reworks motors, he takes your core and replaces it with one already made up. If you want your own done he charges you for the core as well, I thought that was way too expensive.
Anyway, I just wondered if anybody had purchased motor from him before and how well that turned out.

I took my motor apart and now I can't figure out how to get it to park correctly. So I thought I would just replace it. Anybody have a service manual?
Thx. Kim.