Does anyone here use a urethane for spares instead of plastic?

[fordman1]

I use a pitch black for 10 pins everything else I use my strike ball. Unless you bowl on a sports shot that is all you need.

[J Anderson]

I'm just curious. Not not accusing you of anything, but you do know the rules on 118b about switching hands right? just wondering that's all....

Yes I do, and I abide by in sanctioned leagues. I do "waste" half my practice throws using the opposite hand because it makes me feel looser.