My only gripe is the threads on the battery cap. I did know about this issue before I bought it. Mainly I liked the rebuildable aspect where parts are readily available. The gripe others have had with the 510 and beauty ring being flush is a bit mute to me. When using an air flow regulating device or tank simple unscrewing the beauty ring snugs it up to the bottom of the topper. This makes the connection really stable. It Is no where near as big as mangle have said. It fits fine in mine. Will update as time goes on.
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