When you use the BK2 axles you also need a losi spacer on the inside of the inside bearing (if that makes sense?!?!?) to keep the wheel spaced out far enough to tighten up properly.
That losi spacer is the same width as the wheel bearings so I've heard of people using bearings instead...so 3 bearings on each axle, as well as the associated spacer in the hub...which sounds like what you have?
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