Hi Gary I do like your work, good stuff indeed.
There was a thread on Losmandy and Gemini yahoo forums about RA extenders, with a bias weight groove. Dave partridge asked for EOI for RA extenders....all up cost GBP item cost was 60 GBP and DEL 23.55GBP...which is ~ $173 AU dollars. They are made and on their way now! Well mine is.
During discussions, apparently Losmandy also have some similar RA extenders made in their stocks, not the new type, older ones made similar to this, quite cheap apparently.
Anyway thought I'd mention this for interest sake.