Quoted from CNKay:
I was just looking at the floor model duel drum. I could not figure how the covers would secure. It seemed to have a rubber disc with a wing nut but after tightening it as much as I could the cover slid right off?
I was foreseeing a mess if lid falls off.
This is why I haven't used my HF tumbler yet. I'm concerned abut a big mess in the storage room if the lid comes off.