Hopefully I won't ever need these
But if I haven't got them
And haven't practised with them
I won't be able to use them if I ever do need them 
So today I bought the cord and tied them
Hung them on my harness
And the next time we go climbing
Mary can help me try it out

It was going to be today, but she's been struck down with the sick bug that's doing the rounds :-(

p.s. I can't help thinking that I should have known about all this before