While you guys are experimenting and entertaining the idea of some sort of hardware... perhaps a tiny bar tensioner with a small length of shock cord to secure that pesky loose end of the bury. As we know, it takes only a small — but reliable and constant — amount of pressure to maintain the outer cord's grip on the inner cord.
But the few times that I've played around with UCRs I've found that a simple Prusik made with smaller, grippy cord (Atwood micro cord, 1.2mm) works very well.
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