124, Those D-rings have always been a problem, once that I solved by soldering the connection of the ring together. In order to do this, you need a very hot soldering iron/gun, and you must wet the nylon strap that the ring passes through or it will melt from the heat of the soldering iron.
Good luck,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)