The cradle must meet the following criteria:
Ideally, it will also support a few degrees of adjustment from the design angle of 100 degrees. In the case of this cradle, I designed some cam lifters that gave +/- 3 degrees of rotation by pivoting about the bicycle skewers, with the cam pressing against the cradle base. I’m still searching for a photograph of the protoype. The design files were lost in a syncing error with Dropbox.
(cradle angle adjusting with cam mechanism pic goes here)