[RC-Monster Mike]

When Chris (Arct1c) first told me about the Mugen mount, I was a little embarassed and confused that it didn't work(thought I had just become an honorary member of the Jacka$$ club), but then I looked at the pictures he sent - looked like a long buggy with a big spur gear. I am glad we figured it out, though - I thought I was gonna have to redesign the mount (I was pretty happy with the design and how they came out).
I made the mount to accomodate my range of hardened pinions (should accomodate a range of about 12-14 pinion options on the stock 46 tooth spur).

And for the record, Dustin - my gears are harder than the average hardened steel clutch bell. Most standard clutch bells use low carbon steel and case harden it - I do this for the emaxx idler gears, which last a very long time. The new hardened pinions have a higher carbon steel and are through hardened - I would be shocked it they didn't last a few seasons to be honest.
The hard case on your average clutch is perhaps .015" - .02" thick. Once this is gone, the wear accelerates quickly, and the deeper into this material you go, the "softer" it is. My new hardened pinion gears are hard all the way through - the wear won't accelerate in time, so they may outlast the spur gear in all reality - especially the larger ones.