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Rear R pins not spinning / pinion gear issues


Janeymoo90

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In need of ideas and help please! I've got a Tamiya Lunchbox Mini and am in the process of building it. I'm using all the basic standard plastic kit.  When I turn the rear R pins (snap pins) the opposite side R pin turns, but the cogs (gears) inside don't.  I've checked that everything is tight enough and where its meant to be, as had my partner. When I put my finger in the motor housing and manually turn the gear the rear R pins turn, so they're obviously connected, but I don't want to put the pinion gear and motor in if the rear wheels aren't going to work. I also don't want to completely take everything apart if not necessary. Any advice please? 

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its a diferential so if you turn 1 wheel 1 way the other wheel will turn the other way 

if you hold 1 side and turn the other then the gears should turn :cheers:

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