answer:I’m thinking teflon plumber’s tape might do the job. Would that work? It seems like it would give you a nice seal, if understand what you are trying to do. I’m not good at math at all, really, I’m a math moron, but you need to build the ¼ up to 5/16ths right? That’s .0625 inches. Is that too much, to thick a build up to use teflon tape? How thick is .0625 inches? LOL, other than being .0625 inches thick? I get that part. :-) I need a visual; I’m having trouble picturing how thick that is. I did that calculation on google; not by myself. That’s the only way I could do the math.