I used wing nuts, and in larged the holes for a 3/16 wing nut size, I think it is 1/2", but the bolts can only be about 1 1/2" long so they do not hit on the in side skin, other than that 1-4' x 2"x2", and 1-4' x 1 1/2"x1 1/2". That gave me enought room to clear the seam.
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