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The Gossett Box is made out of an aluminum extrusion, with two rollers on each side. The rollers are attached to pins set into knurled brass knobs which screw into the extrusion. Even with two rollers (perhaps an unnecessary redundancy, see, for example, the variations), releasing the rope is easier than on, say, a Bluewater box.
I drilled the holes in the back of this box so that it could be mounted on a Gossett Plate for climbing with the Gossett System, an interesting perversion where the box is mounted at belt level, and each foot has an ascender on a long foot sling passing through the box. This places the box near the caver's center of gravity, making it easy to flip upside-down.
There have been some incidents and rescues with the Gossett System, so just avoid it.
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The initial Version A Gossett Box was refined and Version B was the result. The rollers were shaped, the roller material changed to a graphite-impregnated plastic, and the corners of the frame were rounded. This was the final production model of the Gossett Box, but in my mind, one of the variations that never made it into production was superior.
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©2008, Gary D. Storrick