DRTom - I appreciate your thoughtful research, but I'm seeking info on the Katie JUNIOR (Jr.), a smaller version of the standard Katie. As such, the tuning forks are smaller, intended for use with thin lumber and necessitating a different set of router bits. Info on the Katie Jr. is scarce.
I've talked to Marc Sommerfeld recently and even he couldn't offer much help on a specification or source for the proper bits to use with it. He did say that he believed the Jr. used a 7 degree dovetail bit, which is what is used on the standard Katie. However, I believe the Jr. uses bits with a shorter cutting length. On the Jr. Jig, the tuning fork opening for the dovetail bit is 1/2", requiring a 1/2" bearing on a 1/4" shank, which Sommerfeld said he could not supply.
Whiteside Machine claims they've never heard of the Katie Jig (original or Jr.), which I found hard to believe since they make aftermarket bits for most of the major dovetail jig suppliers. I've yet to try CMT, whom I believe might have supplied bits for Katie and possibly Sommerfeld as well.
Terry Hampton, the inventor of the Katie Jig, seems to have closed up shop and disappeared from the woodworking community.