After years of sterling service I retired my Q-Max cutter for IO and B9a bases. I had only been using them since 1968!
Looking through RS I came across Greenlee, an American Company that produce hole cutters.
I bought one for IO and have never struggled again.
They have four cutters as opposed to the Q-Max two and come with a ball race under the bolt.
Be aware that most are for air ratchet use but n M10 or equivalent Allen bolt will do the trick.
https://uk.rs-online.com/web/c/hand-...ons=4294966187
Use plenty of lithium grease under the bolt head and washer.