1 PPA 2 Embodiments?

Anyone have 2+ small variations of their product and not sure if they can both be protected under the same ppa?

For example if a small portion of the device could be a roller or fixed piece. When you do the line drawings, write up the ppa etc… is it possible to include both the roller and fixed point.

Because the purpose I’m asking is if during the year under the ppa I find either the roller or fixed piece works best if I only included the roller in the ppa now I wont be able to use the fixed piece in the non-provisional.

The key I always hear is to be broad enough in the ppa. But how do you get broad in a line drawing so you can use different variations?

Thanks team! I hope this helps others as well