When you put a wheel on, and it stops spinning freely when you tighten it, it is either because the wheel hex is too deep (solved by using washers to space it out or a deeper hex hub, or even sand down the wheel hex), or the pressure causes the hex hub to bind.
There are a number of solutions for the latter -
1. Use locking wheel hexes - these stop the hex hubs being forced onto the wheel bearing.
2. Find a suitable crush tube - this stops the inner and outer bearings from being pushed together
3. Sand down the back of the hex hubs, so the slot for the axle pin is shallower.
Note: These are generic fixes for the problem, I don't own a Blast!
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