/ Single rope used as a double
Thanks in advance.
I did this for years without incident but no doubt some SPSA expert will tell you it isn't safe because you need a different belay device for different diameter ropes. Just use a waist belay instead like we used to do.
It'll be absolutely fine. If the routes are short, you could just tie into both ends of your single and not bother with another rope.
Generally it works fine. Significantly mismatched pairs can be harder to belay with so you might do better to simply fold your half rope and tie into both ends for <25/30m (typical British) pitches.
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