I hadn't seen the French system before. Very similar but seemingly superior to the Swedish. Sometimes forcing French ideas onto the rest of Europe isn't such a bad idea [Linked Image]

I measured measured a few covers in my home:

Smallest: 75 mm dia, 50 mm high. --> cramped

Biggest: 90 mm dia, 70 mm high --> plenty of room.

The sleekest looking cover is not the smallest.