[FTC]: Is this Mecanum wheel configuration acceptable?

[GeeTwo]

Originally Posted by ImMoMo

Doesn't the Nub also require a set screw?

Just looking at the web pages, it seems that the Tetrix hub has a round bore and set screw, but there are Nubs available with an actual D-bore and set screw. This means that on the D-bore Nub, the set screw is only there to keep the shaft from sliding along the axis; on a round-bore hub, it is also required to transfer torque.