Started putting together the rudder assembly and I have a bit of a problem. I measured 4" minimum from the firewall per plans and clamped the left and right side bearing block. The right side sits flush against the side skin and rail but the left side bearing block is a bit angled. It fits flush against the skin forward but there is a 1/8" gap on the aft end. The plans show the 1" holes drilled at a slight angle but when I looked at them they seem to be drilled plum and level. I tried switching blocks and flipping them thinking that they may fit better but I got the same result. Any ideas on how to fix this?