In reply to Mcgrda:
> ... the sleeve can slide into the ClickUp slot and jamb ...
Interesting. I've just had a play with mine, and yes this seems possible, but pretty unlikely, and it has never happened to me in practice. I'm using the "Locksafe" version of the Rhino, rather than a Screwgate.
As above, this combination (DMM Locksafe Rhino and original ClickUp) has always worked fine for me, with reliable locking every time (so far!) and no slippage when the leader is dangling on the rope. There is wear to the anodising and aluminium, but only moderately so, and it is smooth, there is no hard "lip", so doesn't seem to be a problem.
I guess really heavy users might find it wears quickly, but even a new Rhino biner every year would not be that big a deal.