Hi Max,
I don't have a problem as I have a few decomps here but I often have people coming here wanting them for the F/C's and I know they are only going to get harder to get so I was thinking of a way to solve a problem in the future. I know if the comp is low you can get awau with a spark plug in the hole. I use my mower for many years like that. I haven't tried a F/C with new rings and no decomp but I'm pretty sure it would hurt