In reply to malcolm.harris:
I've some of these hung off a beam as an addition to beastmaker boards, and really like them for relatively injury free pull ups. Very skin friendly. Think it would be a tragedy to sand them and bolt them up
However, have you got any campus rungs bolted up? Maybe a couple of large Moon Rungs.
Additionally I've got a couple of Crusher campus rung slopers
http://crusherholds.co.uk/crusher-campus-board-rungs/crusher-campus-rung-sl...
Which really work up open handed contact strength. Again, very skin friendly. A bit like the Beastmakers, takes a bit of time using them and working in chalk until friction rises.