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Depending on the thread of the lead screw, it may provide adequate reduction by itself.
I have built couplers. You would need a lathe. Turn down the end of the lead screw, and bore out a piece of barstock to fit over it on one end, and to fit over the CIM at the other. Drill/tap each for set screws.
Something to note: adding a shoulder onto the outer side of the coupler and combining with a thrust bearing is highly recommended, rather than allowing the CIM to carry the load internally.
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