Have any of you used the Clover rubber (soft plastic) thimbles with the metal on the top? I have one of them that does not have the metal and my needle slips. It does however fit quite well. I have those darned arthritis bumps on the first joint of my fingers so I need something that will fit over or against them and not cause the pain. I do have a cheap metal thimble that I can use, but it truly is not comfortable.