You might be quite surprised by how little sidespin can actually be transferred from CB to OB (unless CB & OB are frozen together, or the OB is frozen to a rail)...and under what conditions it happens, and to what degree.
It depends on how dirty the balls are to a large extent. If the balls are not polished and are fairly dirty the spin actually transfers quite alot due to the increased friction. Totally clean and polished balls impart alot less spin.