The bolt that attaches the exterior fan housing to the interior fan housing … it threads into a little fitting that is inside the interior housing. I had 2 of the bolts snap off in those, so - I punched them out. I was thinking of drilling them out, but if they are readily available I'd rather just put a new set of 4 in with new bolts when I reassemble it. Anyone know what those are? I looked in a service manual for the motor, but that little bolt is not represented in the parts list as far as I can tell.