I bought a set of step drill bits at Harbor Freight($9) and used them on some big stainless steel washers I bought at Home Depot to get the proper diameter for my
mash/hlt's! (they also worked great for adding a valve and sight glass to my kettle)
Now I can convert hundreds of mash tuns and never have to worry about washers not fitting! Gotta love Harbor Freight!
“I don't drink beer all the time but I can drink (a) beer anytime" - Me