Gray RTV in the small hole since gray epoxy kept popping out. And "The Plug" is really a great buy if you have a hole to fill. I wish it was perfectly flush fitting and held rock solid, but it's close enough and makes it so much more bearable. I was going to tap the hole and put in a set screw but I would have to have cut the screw very careful to not have it look horrible. Maybe I will have to find an original 640 and/or a 60 to keep it company.
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