Did the ACME nut (as shown in the pic) come with it? If so, do as Frank suggests. Instead of an additional nut to clamp (that ACME spec is an oddball one) you could tap a a set screw into the provided ACME nut. Red Loctite might be strong enough to hold the nut in place. Another option assuming the outer diameter of the ACME threading is 7/16", you could but a clamping shaft collar on there and attach the sprocket to that.
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