I've got a really new gibbs ascender, I've probably only used a dozen times or so. Anyway, I'm using a petzl microcender and don't use the gibbs so if anyone is looking for this gadget maybe you've got something worth trading??
its a rappel rack! used for rappeling Single Rope Technique, long rappels, does'nt twist your rope like figure 8's or other descenders do, adjustable rappel speed, can handle heavy loads (stretchers, 2 man pickoffs, cargo, can be used for rescue purposes).
excellent link here, including a pic of the rack (identical to mine)
that looks cool actually srt, could never see using it enough for me, but if you've got any biners, snaps, or I'm about to buy either a beeline or ultratech from sherrill, so anything like that. Maybe you saw one of my other posts with pics of the tenex eye and eye I have, it's got to be replaced. Let me know.