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I acquired this rig from Bob Elron in at the 2019 NSS Convention.
This box is 205 mm. wide, 53 mm. high, 67 mm. thick, and weighs 455 g, including the harness. It is piece of 9.3 mm thick plastic plate with a Simmons Roller attached by two screws and nuts. The back plate has two 26 mm. diameter holes for attaching to a chest harness, and two 8.1 mm. holes for attaching a bungy pulley.
This is a noncommercial plate with no markings.
I presume that the plastic is Lexan, as acrylic (Plexiglas) would be too brittle. If you look carefully at the way the assembly is sewn to the harness, you will see that breaking the plate would not result in the Simmons Roller coming off the harness.
I do not know why this harness's creator did not simply choose a Simmons Racing Single instead of making such a bulky plastic chest plate.
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I acquired this rig from Boulder Sports Recycler via Tom Leahy in 2023.
The aluminum plate is 305 mm. wide, 69 mm. high, 10 mm. thick, and weighs 380 g, excluding the Simmons Roller and harness. The plate has 53 mm. tall vertical slots for attaching the box to a chest strap and 37 mm. wide horizontal slots for attaching shoulder straps.
This is a noncommercial plate with no markings.
The harness is sewn through the back plate and the Simmons Roller. There is no direct mechanical connection between the back plate and the simmons roller. There is another plate sewn into the harness between the Simmons Roller and the back plate. This inner plate is about 200 mm. long, and helps limit the amount that the Simmons Roller pulls away from the back plate. Despite this, the lack of a direct connection allows the roller to pull farther from the plate than it would if connected.
THe resulting rig is heavier than it needs to be. Choosing a Simmons Racing Single would have been a more better choice, resulting in a lighter system as well as saving the effort required to make the back plate, hidden plate, and a harness that contained the latter.
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