I have a need to make the Lunette ring swivel. In doing so is it best to use a brass shim, Teflon shim, or both in between the compression surface? Maybe a sandwhich? This will be added to another assembly so the swivel rings on the market now just wont work for me, hence I need to fab one up. Any thoughts or ideas would be appreciated. I do intend to building it with a zert fitting for grease.