I am pretty sure my carrier does not have pins, the masking blades move freeley which is why I just use tape. If you really wanted to get fancy you can ask the glass shop to frost one bottom glass insert for 35mm and have one unfrosted for 6X6 or for that matter another frosted for 6X45. I had considered doing this but too lazy to find the time to hunt up a shop. Also not sure what it would cost.