Hi - I have recently acquired a custom 12.5", f/6.5 double truss dob (as described in my sig) which, after a few nights viewing, I am very happy with. However, I think the base could be improved as its rather hard to rotate. I don't know how standardized these are or if there have been any innovations that I could add.
The design is very simple with a clipped-triangular base platform that has three hockey pucks as feet on each corner. This is attached to the rocker box by a single central bolt. There is a large, circular textured teflon sheet on the bottom of the rocker box and opposing ~2.5" diameter teflon circles attached to the base platform (above each hockey puck). The entire scope weighs about 76 lb, including the base plate.
I find that while the rocker mechanism works fairly well, the rotation of the scope is a bit stiff and can cause you to jerk beyond your target, in particular when you are trying to track an object. Is there a better way to set this up or maybe a way to tweak it to be a bit more compliant without being too loose.