mountain bike freewheel hub stopped rotating So I was trying to replace my rear bearings and got stuck, (see question below):

how to reassemble mountain bike rear wheel hub and bearings

After this I felt confident to go ahead.  Was putting it back together with my son and we had it most of it back together (no cassette on it yet).  We put the quick release through the axle and span it, all seemed nice.  I held the freewheel hub bit and he span the wheel (slowly) and it made the normal clicking noise as it rotated.

So we tighted the bits and went to put the cassette back on.  After tightening the cassette locking nut we noticed that it was not rotating.  Tried loosing the cone hubs, nothing, tried taking everything off but still nothing.

I am not sure if I have somehow killed the wheel or there is something I need to do to get it rotating again.

Any and all advice on how to get this working / rotating correctly again would be greatfully received.

Thanks
Personally I think you have somehow managed to tighten the outer bearing cup that is part of the freehub body. It has two notches on either side, take the cassette off and see if you can knock the notches back to let the freehub spin.

If you have a Shimano hub you might want to also consider putting a new freehub body on there. These are LBS stocked parts albeit not an everyday request.

The bearings in the freehub can survive a bit of abuse, so long as you don't get too much dirt in there so consider DiY and, if that fails, pop a new freehub body on.