I'm clueless about Tobin innards, but Researcher should be able to help.
I would very much like to add images here, which I'd be happy to post on the Forum, maybe with a tutorial from you regarding disassembly and reassembly tips?
http://www.picturetrail.com/sfx/album/view/22641451

The Tobin congregation is small, but always interested in the preaching wink
Please send full size high resolution pics by jpg attachment to revdoc2@cox.net and thanks!