crwdns2933423:0crwdne2933423:0
crwdns2918538:0crwdne2918538:0

crwdns2934241:0crwdne2934241:0 Dan

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While hard to see there are two slots within the ring as seen in this diagram. You need a spanner tool or using a rubber stopper which has the center cut out so the lens surface is not touched to spin the ring off.

[image|3659425]

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open