The Franiec Grip for RX100Mk3
Likely old news (since I assume the same grip works with the original and Mk2 versions of the RX100) but I'm really liking Richard's grip on my RX100Mk3. It suits my largish hand well without adding to the depth of the camera. I tried the Sony grip first but it didn't quite do it for me.
Good support from Richard, too. My first installation was poorly done; I could shove an index card into the gap I left at the lower outside corner of the grip. No problem: He sent me some replacement adhesive tape. Then it was a simple matter to remove the grip (using dental floss), clean up the adhesive residue from the grip and camera (rolled most of it off with a finger, then finished with alcohol on a soft cotton cloth). My second installation was close to perfect.
My kudos to Richard for the design and appearance of his RX100Mk3 grip -- and for his excellent support.