Can you upload a photo to Imgur? My first suggestion would just be to try and force it to be square, just bend it with your fingers until it fits. I could possibly give better advice with a photo. I think all I did was force it by hand until it was square-enough. Also make sure the bearings all fully-inserted into the wheel. vice/hammer them fully inside and they should be pretty square. The alignment between the parts of the escapement is the most annoying to get right.