Realized that a steel golf shaft makes a source for punches for flip flops and other foam sources....just one of many sources of course... but you can buy used golf clubs at thrift stores for as little as a buck...or talk your golfer friends out an old club...or a local golf course.

The metal shafts are tapered [some are stepped..no problem]...butts for men are 5/8's of an inch on average and they taper to the tip...ok, ok, I was going to delete that phrase but I know nobody will go there...[G]....you can cut them into segments at whatever diameter you desire.