Here's my Precise Simplicity 18650 with a Grand Vapor Trident and an Envision Vapor glass tip. It took several tries to find the right combination of washers and O-rings for the Sony batteries I'm currently using. I ended up going with four washers and two fat O-rings. The fit is perfect now, with zero battery rattling. It hits very hard and the craftsmanship is some of the best I've seen.
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that 22mm atty looking pretty flush on that 20mm mod.. maybe the 'steps' on the mod on bottom and top add an extra 2mm?