It looks to me as if the clamping block is too square on the rail to jamb in position, it needs to be able to tilt more. You could screw a thin plate on the rear to engage in the threaded rod, if all else fails I would drill a series of holes along the length of the rail and just use a pin through as in a sash cramp. Seems a shame to lose all that nice work.
Yes, thé threaded part, it's just too thick, too well guided along the bar. Imagine if you get it even thicker, you would obtain a slip fit, which is the contrary you want in a clamp.
This piece must rock a little bit in order to get locked on two points on the bar. So I would make it thinner or open a bit the square hole
Paul Jones (Dec 19, 2018)
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