New rotary setup

So I ordered another rotary, always used the hot dog style had it dialed in. But now I have this one in the attached picture. Couple of questions, 1. How do I determine steps per rotation? 2. Do I measure the roller diameter with the o-rings on or off? Thanks.

Nevermind now, I boxed it back up and sent it back this morning. While it was a decent design the motor got very hot and it kept spinning whatever I put on it off. So I’ve found another one on Ebay.

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