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Gimme a day or two...I can probably get specs and a pic of the Brownells wrench, which is basically a tube of the right diameter with two small lugs or teeth sticking up from the end of the tubing to engage the slots in the nut that holds the forearm on, and a piece of rod stock through holes at the other end to give you something to turn it with. It would be pretty easy to fashion one with a hacksaw and a mill bastard to clean things up and fine-tune the size of the "teeth."
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