I have a can of wheelers cerama coat on the way that I am going to use to coat an action only and am just wondering how I am going to protect all the threads on the action from getting coated. For the scope mount and stock threads I am just going to use spare screws from my box o parts. I can't think of a good way to protect the threads in the action where the barrel screws in. My only thought would be a old barrel if I had one. Any ideas?