I just wondered if anyone does this, not to alleviate running out of adjustment but to prevent metal to metal contact. If you notice, some mounts like Hawke and Nikko have small strips of soft adhesive tape within the rings but I find it always leaves a messy residue so I have been removing this and using ordinary pvc electrical insulation tape. If this is acceptable, is there anything to be aware of? Such as how much of the ring inner to cover either all of it or just half.