Very simple adapter for the gBeam: Mount you old minolta-bayonet-connector.
It works very well for me. Just bend it a bit open, attach it to the lens and screw it in.
Update:
In the meantime universalist himself published a compilation of different SLR-Lens-Adapters:
http://www.thingiverse.com/thing:1062085
Thy them first!
minolta-bayonet.stl | 177.2KB | |
minota_bayonet.FCStd | 162.8KB |