I just got my hands on a very minty F3HP for a swingin' deal. I love the camera so far, but with the heavier ZF lenses that I have to use on it, my fingers cramp up on the chintzy nub. Does anyone make a small grip that screws onto the body? I can't find anything..
Something along the lines of this would be perfect (who knows who makes it):
Get the MD4 Motor drive, that was the defacto grip for the F3. And if you cant find that smaller grip for sale, make one. There is a product called instamorph where you can fabricate plastic pieces quite easily by hand shaping/molding. I have created custom grips for my olympus cameras this way.
There were two manufacturers, both discontinued but I do see them on ebay every now and again. The last one I saw was maybe 5-weeks ago, don't know if it sold and it was on a F3 body. It was the USA metal version and I believe the manufacturer still exists but only make the grip for Leicas. If I find it I'll come back but it was simply called GMP metal grip.