jacsr - the plate and head are still and the camera twists!
nrothschild - I'm glad to see someone else thinks that camera manufacturers have dropped the ball here. I was thinking I was just being a grumpy old man - " remember when ...", "in the old days...". A simple hole and a corresponding pin would eradicate this issue. Having considering one radical option for a few nanoseconds, I decided NOT to take a drillto the camera!
I will pursue a plate with ridges, and have found a L plate for about $120 on the interweb. I need this setup mainly for macro shots or nighttime, so there is usually plenty of time and no urgency to setup.