Ok, good info.

Should add that the overhang from the teeth over the blade body plate is much greaterĀ  than regular blades. This can cause binding on some pre-relief-cut inserts that have the arbor side cut not backed off enough

Very odd that the blade set would not spin (there wasn't a spindle lock or other device?) That is an 8" set correct?

Either way, I find uses all the time for the set, especially handy for making tenons and other "dadoing" type operations without the typical dado set bat ears. Amazing clean crosscuts too!