So yeah...someone must have overtorqued the begeezus out of the drain plug before me, as I was removing it today part of the mounting boss came off with it, so even if I did retap the threads...still not what i would consider durable and trustworthy to keep that bolt in. I am thinking JBweld the bolt and broken boss piece back up...anyone have any ideas for an alternate drain plug or means to remove the oil for subsequent changes? The rest of the case looks pretty thin since the drainplug has a raised area for more thread engagement. Maybe some kind of drain attached to the clutch cover..but I don't think it will drain all the wear materials out since it does not appear to be the lowest part of the engine. Would hate to relegate such a good runnignengine to parts duty.