Status: How To Guide
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Fiddling on my Monster Beetle Slipper clutch last year, left me thinking a lot about different Tamiya bearing sizes. Having used sealed gear diffs for a while on my TB03, 417, and my M05 and M06 chassis, I still do not understand, why Tamiya doesn´t bring out a sealed diff for the M03. This would be a great seller for FF01´s, Manta Rays...
Then my Race buddy Jochen donated me his old M03 beginning of the year, as he cleaned out his mancave. It was quite battered up, but as I had all M-chassis with exception of the M03, I decided to restore it as fun runner. As the ball diff was done, an idea came to my mind, which I call now the '1280' trick: It goes rather simple: Grind up the bearing housings in the chassis from 11mm to 12mm, to fit 1280 ball bearings! Then I used a Spec-R oil filled M05 gear diff, which uses 1510 bearings. The Spec-R seemed ideal to me, as it is symmetric and has quite tough plastics. This was needed, as I had to turn down the bearing seats from 10 to 8mm to fit into the 1280 bearing. Finally, I grinded the chassis holes for the diff shafts to 10,5 mm. This is needed, as the diff has to go in completely with bearings and outdrives mounted. Now the door is open for a quite reliable runner without fear off a slipping diff.
I´ll also try some diff setups with very thick oil on this one, as the Mini experts do on RC-Tech.
The tools I sourced really cheap on the 'Faszination Modellbau Friedrichshafen' last week. So it was less than 20 € for both. Worth every cent, it worked really good. Can´t wait to assemble the whole Mini and try it on the track!