eman --
THANKS for your comments, and thoughts. YES, I have thought about making them for other units. And it is something I will likely eventually do. The issue for me thus far, and the reason I haven't branched out to other machines yet, is that most machines use "S-type" shafts, and that introduces an extra level of complexity, in terms of building a carbon-fiber shaft. If there was some demand for a "straight shaft" for some particular machine, I'd definitely be willing to look into designing one; it wouldn't be that difficult -- using the Equinox shaft as sort of a "template," but with the proper diameter tubes and connectors that would be appropriate to the unit. That "S-bend," though, is more difficult...
Thanks!
Stee