The 'pips' were simply a design choice and in zero way do they actually serve a function. Well I guess that's not 100% true, I use them to line up the airhole on my
rda, but that doesn't really count lol.
As for the picture, if that image is accurate, it looks as though they've gotten rid of the adjustable screw for the 510? The pin on the underside of the top piece is flat, whereas on all of the others it's an actual screw head. Maybe it's adjustable by hand I guess.