Here's a shot, Jim... The "message board" sizes I chose for the photos in my previous post is giving me a "file size too large" error this morning. Don't know what I'm doing differently. Hope you can see the crack, just to the left of the (spring-loaded) bolt that goes through the claw.

I did not remove the derailleur with the claw still on the bike; I put the claw back on, by itself, to take the above photo and illustrate how things mount. Replacing the large mounting bolt in the derailleur (on the right end in this photo), I found two small holes into which the spring tang could fit, probably to change the spring tension. The Suntour has nothing like that!

I'll check with the LBS where I bought this bike (from its consignment rack), about 15 years ago. I'm sure (well, I hope) they'll be able to help.