Just a FYI. There isn't a gap between the simplicity and the Euforia. The Euforia tapers in at the base.
Are the internals of that an exact copy of the Penelope? I ask because if they are then you can adjust the center post when you assemble it (within a mm or two). So you can have a gap or not, whichever you prefer
Speaking of gaps, I just got a used Spheroid today. It mounts flush with no gap . . . but that's because the center pin on it isn't even making contact
