here is some thing i just started to do not a big deal .i came up with this one day ? well i think i did never seen any one do it. on a lot of the blocks i use brass plugs. some guys like the looks so they do not want them painted .i use the 620 lock tie on them so i like them clean with no paint in the plug holes they get sanding clean for good hook up for sealing. so i use a old paper towel roll it works from 1.5/8 to 1.3/4 so sbc to bbc