I have a Beseler MX45 and a 150mm lens. I tested to see what happens if I tried to get space around the outside after I read this earlier. My usual negative carrier is a glass one, regular Beseler. It barely lets me get to the inner edge of the rebate. I put a negative between pieces of glass to see what happens and there's only room around the image to get a little bit of black around it. The light is in a circle that almost touches the corners of the image (not quite, but really close). The image was about 9" by 11 1/4" because I didn't move the head from where it was - I'd figure it wouldn't be much different at different sizes. The condenser bellows is as far down as possible.
While mine does not cut off any IMAGE corners, it does make it difficult to put a black border around an image. If that's how the OP's is, I'd figure this is more by design than the enlarger being messed up. They optimized the light path to get the image to be fully lit, but without extraneous light.
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