As if things weren't bad enough already, it seems that the drilling on the base panel is coming up too short the Y (front to back) axis. Left and right fit great, but I can only get either the rear rail screws properly set, or the front. They won't both fit at the same time. Would you guys say it's OK to use a Dremel and expand 'em a bit? Or should I just get another part from Folger?