Rick,

Thanks for the info. I will bear down and tear it all apart again to put the blind nuts in. Geez, I hate the thought. LOL I have a slimline inverted pitts smoke muffler and I too cut the opening in the bottom, but I pretty much have one slot cut out wide enough to slide the cowling on easily. You need to crawl under it to see the cut out so I guess it's ok. You forgot to tell me what size prop you were using. You said it was a Master Airscrew Classic but no size. I have a 16/10 but was wondering if I should go to the 17/10.