In reply to jon:
> Hmmm, I was trying to get a route wired this afternoon. It's got a very hard start and another very hard move just below the belay, so I guess it's not a very good candidate for shunting!
Just sort the rope so you have some stretch but not too much.
I guess its a new or existing sport route with a lower in place.
Get to the LO somehow. Back rope lead or stick clip.
Fix one end to the base and/or another route. Tie off the rope at a suitable distance from the falling off point to get the fall factor comfortable. I know its only supposed to be a slump but the shunt sometimes does not run and a small fall factor fall results. I think Petzl do not recommend anything approaching Factor 1. Things snap!
I often use a prussik or similar to rebelay on the way down as it can be placed and adjusted with tension on the rope without interfering with the ab down.
Post edited at 22:18