/ DMM Fly lower hand rest
Incidentally, I've emailed DMM twice with this very question and not even had the courtesy of a reply. I would have expected better of a locally based company.
I put the old petzl grip rests on mine. Couldnt manage to drill them myself so put into a machine shop to get it done. I upgraded to Apex's a week later anyway.
I managed to get the old style petzl quark pinky rests on my DMM fly's. It did require drilling out a small 5mm hole in the spike to get the bolt through.
My advice is to get a tungsten/carbide drill bit (at least I think it was) and a pillar drill (as it's most stable) and got for it. I did and I thoroughly enjoy climbing with my fly's in this way.
I bought some my Flys 2 years ago, no need for drilling
I have used two jubilee clips on each tool, one round the base of the tool and the other through the loop of the first clip. You then mold the second clip and cover with duct tape. Cheap and easy and works well.
That's what I did too, suffices for me.
The grivel triggers work well and can be removed if not liked. Triggers with the metal trig sawn off are otherwise identical to Sliders (that are no longer available).
The main negatives to this is cost (30 quid) and the handle has to be held a bit higher up.
The Petzl trigrests (not griprests) are extremely fragile I have broken 4 over 2 seasons.
I did mine with a Petzl one and its still working fine http://www.ukclimbing.com/images/dbpage.html?id=104120
Doesnt take too long to do and the extra hole was very easy with a new drill bit ;)
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