Current Projects chat and miscellany

I've broken my 4th of these now and I need something to go in their place. They're a shit design anyway. They only fit the supplied, low quality bolts which work themselves loose. The heads of the bolts also sit too proud, marking bottles.

King Ti are nice but too pricey, stainless nice but too heavy.

Cheap alloy cages work pretty well but tend to mess bottles up very quickly so I'm looking at things like the resin Elites (below).

Any thoughts and/or recommendations?

Water has a mass of 1g / ml. If you've found a stainless steel one you like just don't quite fill your bottle to the top. Are we talking something like 30g - 40g difference per cage?