Pipe will work just fine. We use 3/4 solid steel rod if on plywood or concrete. Golf balls will work to but can get out of line and cause safe to tip at times.
Hi Y'all (thats what we say in the South)...Safebuilder here from Georgia. I custom build gun rooms, vault doors and mobile safes. All started from my love of firearms. We also cut custom AR 500 targets. I've 2 young sons that love to shoot and I am really interested in improving my LR shooting...