I have a pre MKII NN3 which I use with a Nikon D7000 and a Nikor 10.5 Fisheye.

The D7000 is heavier than the D80 that I used to use. This additional weight causes the upper arm to sometimes slip downards slightly as the camera is rotated. Is there a way to replace the upper arm of the NN3 with a Quick release clamp and an R1/R10 lens ring/clamp?