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I guess I thought you were looking for a way to drop the board just enough to slide it out while the rollers are still on the sled frame. So, if the board is 1/8" proud of the sled frame, then all...

After a bit more thought, I'd re-arrange the hinges as in the first attachment, and then to tighten, simply twist until the two clamp boards are at 180deg, standing flat on top of each other. The...

Haven't studied the design of the carrier sled in full, but am wondering if a double hinge action clamp might do the trick... (See attached rough sketch.) This would avoid the friction issue. The...