Would appreciate any tips. I have a pair of custom cut R1 lens which are just a tad too big for the frame. They fit but its so tight the rubbers can't go in at all. It appears there were minor deviations between the different generation R1s. In your experience, is there any way I could shave/cut the lens just a tad smaller? For example, Sandpapering the edges? Sending the lens back to the cutter is not an option since I would incur overseas shipping charges and it isn't bothering me enough. Thanks!