The B44 hex is too deep for the tamiya hex, you can buy tamiya rims or add a 1mm shim between the hex and the wheel so it clears the knuckle
Tamiya sell a wide 10mm hex for B44 style rims which is on eBay
I went to 12mm hex on the front using Hobao h2 Orange alloy hex with a shim behind the pin, it does make the front track a little wider so make sure it still fits in the box
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