I just received this lens off a Japanese seller on Ebay. I didn't notice it in the pictures, but this lens is mounted to the Toyo lens board via 4 screws instead of 1 retainer ring. Is this common practice? Getting those nuts off will be difficult to start. My concern is this will be mounted to a wood 6x6 board and the thickness of the wood may cause issues with the studs. I dont think the studs look that long, as the Toyo board is quite thin. Would a retaining ring even work mounted to an Ansco 6x6 lens board? Im concerned I may not be able to remount this on my needed board. What does anyone suggest? Also if it was necessary, could the studs even be removed? I wonder if my wood lensboard would need the thickness around the hole reduced to get this to work?