tenex
reality-based
Depending on the model involved, it seems Leica may send you either taller rubber rings to put on your existing sleeves, or taller sleeves to put your existing rubber on. (I suppose if you already have both, you're out of luck.) Why both parts can vary, I'm not sure. Why they don't just build in 2-3mm more depth in the first place I'll never understand, but other manufacturers have this problem too.