if you are talking about the "shave plate" (40) attaching to the "housing"(24)...there should be no gap. Perhaps you have the shave plate on upside down? the profile looks like an "L" the "L" should be concave down towards the ground. Long part of the "L" towards the forward direction. it is a little counter intuitive but that is how it mounts. you can kind of tell that from the attached image from the parts list. if you want an actual picture I can upload one tomorrow. my spare blower is in the barn - no real lights, the other is on the tractor waiting for snow.
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