Timing Pulley Stock - Machining Question

[Sh1ine]

We are trying to create custom length timing pulleys. We ordered stock from Stock Drive Products (25 tooth GT2.) We need to cut it to size, face it, and center drill a .500 hole so that we can broach it later. When we put the stock into the lathe only two of the three jaws make contact with the outside of the pulley, the third is in between two teeth. Does anyone have suggestions as to how to cut and face the pulley stock?

Thanks.