The first beavertails had springs to hold the inserts in place. That, along with heavier lug bodies, made them heavier. It's part of the appeal of the flat gray interior era drums. I don't know exactly when they went to C-clips to hold the inserts in place. It's the other end of the spectrum from the light weight Fullerton hardware. BUT, the springs can make noise when recording, so cotton, or something, was or is often stuffed in the casings to stop the noise. It made me think that I prefer the early C-clip lugs. I suppose that the 3 ply shells, combined with spring lugs might be the ultimate? Any thought? Ace P.S. My mardi gras Tower/Powertone snare in my avatar has springless lugs. It has me thinking. P.P.S. If they made Holiday snares with tall rims and beavertails with springs, that would be a heavy drum.