the good news: the shaft has been replaced.
the bad news: i pulled the CPS from my spare block easy enough, but the cap head bolt in my current engine stripped quite readily. access isn't easy, as the downpipe and some engine ribbing are in the way of any tools. I probably will need to cut the exhaust out. I always wanted a straight pipe, I guess now is as good as any to make it happen. sigh...
whoever thought it was an ok idea to put these tiny headed bolts into an engine block can go to hell.