And he moves! The 'grooved ring' of the D-Lux 6 is unfortunately smooth. Now Just try to narrow the smooth part in the right direction to pressure! It come to ideas of hammer and chisel! Call the seller calms and encourages - very friendly! - Not to hammer and chisel but patience and further experiments and suddenly it's easy. You have probably try make different where you touch the ring while turning. As I said, suddenly, everything Zack clear. The automatic lid fits perfectly including the included filter adapter and filter. Great product and great service. THANK YOU