Note: Many of these articles are very old, and although the technical information is still relevant the equipment mentioned may not be (for example a Stormy cooker was state of that art in 1995, but not in 2021).
The following techniques are for those ‘RP O’ situations where anything is better than nothing. I’ve used all three techniques several times and they do work – just don’t expect them to work all the time.
THE ONE SIDED PULL
You will often find yourself in a situation where you have a parallel crack but have no cam to fill it, especially if the crack is wide. One technique that can work is to use the hex sideways in such a way that the force is only applied on one side, and so create a far more effective twisting action than normally achieved. Once set give the nut some very strong jerks to lock it in place, and extend it. The strength of such a placement is dependant on how much metal is in contact with the rock, and what the effect of metal distortion will have in these areas (i.e. if the nut is just in contact and you lob onto the cammed nut, it may blow if the metal distorts enough for the cramming angle to be lost).