It is entirely possible that the 4 carriage bolts with spacers, in the slots that the plate slides on, are missing some or all 4 spacers.
If so, the plate will not slide up/down with the hand adjuster wing nut.
The mounting plate should be free to slide up/down with the 4 bolts/nuts tight.
The spacers can be made using a pipe nipple cut to length, and a drill run through to open them up just a bit.
Clear as mud?
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