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You've got 3 different tools there. The upper one is pretty self-explaniory as the frame is already in it,
The middle one I have no clue.
The lower one I have one of. It is designed for the threaded rod to be attached at one end to the L shaped aluminum bracket as pictured. The other end of the threaded rod passes through the hole in the adjacent arm of the L bracket, and then the knurled knobs are screwed on. Fully assembled it is a 4-way screw clamp.
Crude drawing of how one corner should look with the screw cap outside the L bracket.
The 1st and 3rd are for very small frames, no bigger than 10" square. The 1st one would be good for a miniaturist.
Very much appreciate the advice...l wiil endeavor to figure out the middle tool(s).
The tools were in the same box, and are a part of the framing business we inherited. Being in the same box, I assumed the 3 tools were designed to integrally work together. Again, many thanks.
The lower clamp with the knurled knobs works very well if your frame is the right size, but it is a real PAIN to thread those knobs back and forth. DO NOT apply your glue until you have the device in a close approximation to the size you need or your glue will be long dry by the time you have done fiddling with the durned thing.
Mind you, it works great (I have two large ones, a set of extensions, and a miniature one - but it is the very definition of a PITA.