Freewheel Adaptor, 16 mm ID x 1.375-24 tpi OD CW - Right Hand Threads x .9" wide, has 5 mm key way and two set screws.
This could also be used with a 4 mm keyway as the set screw would hold the key in place.
Be sure and add the freewheel or any other parts you need to the cart.
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