I agree with Stephen. The disc is not centered, and that's why your alignment tool doesn't slide in all the way. If the alignment tool will slide into the disc at all, the splines are good enough. I see no problems there that would necessitate a new disc.

Gentlemen, thank you for the help. I adjusted the clutch & put the plate back on, transmission lined up tight, & all is well until it's time to put it all back in the car. What had happened, only because it happened again tonight, is that I was not pushing the tool far enough in, & as I was torquing the pressure plate it slipped out. Caught it, fixed it, & I'll be ready to install it once I get another pair of hands over here to help. Thanks again.