I have a Morse and Milwaukee arbor that is much heavier than this one. I ordered a mandrel for use with a 6" countersunk can hole saw. After cutting through the pesky 3/4" cypress, the hole saw tightened the pins that didn't fit exactly so I couldn't loosen the ring and I use large channel locks had to release enough tension to remove the hole saw.This pergola may only work for drywall, but if you are planning a pergola that will last more than a small project or two then this is not for you.