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Here is my 12mm hex wheel adapter for the lengendary TAMIYA Bruiser (also Mountaineer) and the HG P407 clone.
It is designed as a breaking disc for the front axle :-)
For use this adapter, you just need to drill a little hole (Ø 2mm) in the axle at the position where the hole is in the hex of the adapter. Than you put a pin (Ø 2mm and 11mm long) through the hex and the axle - READY.
Now you can use almost every rim with 12mm hex ;-)
You can use the original wheel nut to tighten the rim by using my nut-adapters (see my other products)!