I think it was Hugh Spencer (Bodger's webmaster) that I first saw using one like this...
The rest is held to the bed with a long bolt which tightens with a large Oak 'nut' into which I araldited a captive nut.
I made this one as part of a lathe I built using reclaimed and recycled timber. It's a chance to turn the central pillar and the last time you have to use that old stick rest !
The tusk tenon is similar to the way the poppets are held in the bed.
Designs could probably be altered, adapted and improved...
We spotted this lizard yesterday - unusual and exciting. I think it's the first time we've seen one in the 20 odd years we've been going to The Forest