When you can be bothered or have the time, I'd be very interested to see how you did it
OK, here's a little bit more:
A quick cell phone picture of my current "pigtail" setup:
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As previously mentioned, the pigtail is long enough to hang below the camera body, moving all the hardware out from under my hands. The only other bit I think I haven't mentioned is the very small welded stainless ring that connects the pigtail to the split ring on the camera body. This turns out to be necessary because after a time the sharp cut ends on the split ring will chew through even the stainless steel fishing line that I am now using. The split rings (#7 size) and the welded rings (#5 size), the wire line and crimp ferrules are very cheap from fishing tackle suppliers. I think I bought 100 split rings for three or four bucks.
In this shot there are two separate lengths of stainless fishing line. To an engineer this is kind of silly, as the line is good for at least 80 pounds. I carried the cameras for a year with just one length but it always looked so fragile to me that I doubled it up for good luck.
There is a tricky bit with the barrel. It is countersunk inside for a flat head screw and when that screw is in place there is almost zero clearance between the head of the screw and the quick-release swivel. This make connecting the pigtail difficult. So what I do is use a 3/8" end mill in a drill press to flatten the countersink area, leaving more clearance. For this purpose, Chinese junk is probably completely adequate:
3/8" High Speed Steel HSS 4 Flute Straight End Mill Cutter Totk | eBay It may be possible to make this cut with the end mill chucked into a hand drill motor, but I don't think it would be easy. Best if you have a drill press or a friend with a drill press.
Once I have flattened the bottom of the barrel, I use an S-shaped piece of wire to connect the pigtail material. I have frequently used light nylon cord as pictured, which has a softer feel than the stainless wire. YMMV.
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The wire is 0.041" stainless aircraft safety wire, which I happen to have on my bench. Any stiff wire should work, but I'd avoid soft wire like copper. After I've connected the pigtail to the S-anchor I epoxy them in place at the bottom of the barrel.
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Hope this helps. Any questions, feel free.