In reply to lummox:
There is a tiny version of the DMM bug, designed for super skinny ropes.
And when I say tiny, I mean TINY. it looks embarrassingly so.
Dunno what it's called, I got one bundled with a load of other crap in a job-lot I bought of eBay a while ago.
I look at it and wonder how one could fit anything bigger than twin ropes into it, or whether it would break if i dropped it!