Any special modifications or will a box stock grigri do the trick?
Nope. No modifications needed. From: Brutus of Wyde, 10/26/2001 As a general rule, the grigri rocks as a backup. However, it may not always be the best tool: 1) As noted in other threads, the Grigri may be ineffective on thinner diameter ropes. I have rapped and jugged on 8.8mm ropes, but I wouldn’t trust a Grigri as my safety backup on one. Knots are knot known to be diameter-dependent for their function. 2) Following long pendulums, and some unusually intricate and traversing aid pitches, can sometimes require the ability to fix ones self into the rope with resistance to both upward and downward forces, depending on the system used. Especially if you get as confused as I usually am. Clipping into a knot in the rope is a better option in this case. 3) When cleaning a pitch in the afternoon on ZM, I let the rope loop down below me with no backup knots. (I was using the Grigri as my backup.) I did not have a rope bag. The updrafts blew the rope 50 feet above me and 75 feet to the side,
