Have to use the spindle ball and cup axle square taper bb. Have a Veulta track crankset, have a bmx chain, new16t freewheel. Here is the problem, the rear wheel is a threaded Shimano 600 designed for a screw on freewheel which of course works with the new freewheel. I think the spacing/chainline is askew. How do I fix, not sure I want to get the wheel re-dished? Is re-dish the only option? Spacer? How do I determine the correct chainline, looks like it needs to move right. Hub is a 126mm designed for a 6 speed screw on freewheel so the single speed freewheel is in the low or second lowest gear position.