Found this smaller magnetic circular polarizer. GGS size is 22mm. Haven't decided if I'm going to install it or use it. Seems to be perfect fit. The magnetic ring only covers up couple holes in the case. About $7 shipped on eBay. Search "GGS magnetic polarizer 22mm".
Here's the ring over the lens. Metal ring shown still has the paper cover over the double sided tape. You can see the three magnets and groove on the lens holder.
Here's with the ring back in place on the filter.
Here's the ring over the lens. Metal ring shown still has the paper cover over the double sided tape. You can see the three magnets and groove on the lens holder.
Here's with the ring back in place on the filter.