This is the first I've seen these and think it was a quiet change the Ephro decide to implement that is a really good idea. Ehpro already made a nice KFL Lite Plus v2, but it looks like they are up to v2.1 or v3 that implemented dual air holes. I was just thinking tonight that I didn't like keeping my atty off the top cap to get more air flow through the screw hole... Looks like they agreed.
