I've installed many Euro hinges, but nearly always have built my cabinets from scratch. This time, I am using the pre-drilled 11-3/4" melamine for the cabinet sides. When I ordered the euro hinges (54 of them), they came with screws already installed. The shelf pin holes exactly match the the euro hinges. I have heard that the euro system was designed like this, but now I have a problem. The hinges don't have much flexibility up and down. When I drill the 35mm holes in the doors, is there a magical trick or rule of thumb on how to get the hole positions correct? Any help will be appreciated.