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every once in a while someone posts a mystery tool. Here are mine. As you can see, the one "machine" has a rack and pinion, the rack being a hard plastic. There are some springs in it.
The other piece is sort of like a drill press device and someone used clamps to hold whatever it was they were doing to the machine. Someone told me he thought it was used by a gun enthusiast.
I picked up both pieces a while back at a thrift shop, hoping to someday use them as is or modify them for some type of future project
DaveV