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I have a drawing at home that might help. I took a reference photo from MoM and made an assumption that the main tube on the pack was 4" in diameter. I scaled the pic to this size, then measured the different sides of the details you are talking about. I drew up a nifty little image on graph paper based on the visible details and the dimensions that I measured. It is a view from the top.  The details were evenly spaced, and it came out perfect! There were no odd spaces left over. Even if the scale on the pic is changed, the number of vents should remain the same. I'll scan it in when I get home. I think it will help you out.


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