Take a look at this valve stem…
After realizing the top hat was out way to far yesterday, I turned it in, and went to tighten it back down, and then realized I tightened to far, putting dimples in the ID of the valve stem, because I never felt the grub screws ‘Botttom out’ against the valve stem. Maybe this is why. There is almost no wall left on the stem where the grub screws tightened up against, going in to far and making dimples in the ID of the stem. I tried to bring the top hat out a little just now, and it won’t turn, even after taking grub screws completly out. If I force it to turn, the whole valve stem turns with it, it’s like one piece now. I can’t believe how far off center the ID is.

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Yes, Tim knows his stuff, he’s been doing it for years, but he really doesn’t do much work on AF guns. For the most part, if a customer has problems with a AF gun he’s sold them, he’ll just send it out to AF to have it looked at/repaired. I think he will still do a ‘tune up’ of sorts on AF guns at the customers request, but that’s about it. No real serious custom work like he does on so many other types of guns.