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I have the ARP 556 battle ship grey version. It doesn't have the hole for a set screw. I'm looking at some videos of the ARP9 amplifier removal (which has the set screw) and it looks like there's glue or something on the threads. I would remove the set screw and clamp the barrel and amplifier and give it a good twist (verify direction first) and heat it up a little in case there's glue. Best of luck
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