Transom Protection from Clamp On Outboards ?

What is the best route for protecting transom gel coat or paint from getting gouged up by the motor.

Ive noticed some small boat builders have what appears to be a black rubber product for protection but havent been close enough to verify what the material is.

Thanks.

 

There may be some sort of cap that can be fitted over the screw clamp washer, but it would want to grip well.

 

How big is the OB? A FG boat? I sanded a strip where my motor clamps on and used truck bed liner in a neat black strip across the transom. Doesn't look bad on a jonboat holding a 9.9 hp OB.

 

Stick on some pieces of resin sealed plywood? That's how it's done on dinghies.