Here's one made with Thunder Tiger parts, like the original made by cowboy a few years ago. Again using sjcrss idea of threading holes in the spur gear. I made this one for my 3.3 Revo. I think I said it before, the only difficult part for me making these diffs is threading holes in the hardened steel spur gear. So I decided to order an all carbide tap. Expensive stuff but I use M3 taps so often, it will be used often.