Fitted the top and added the snaps to the headboard. Might have over engineered this but I was picturing going down the hiway at 70 mph and hitting a 40-50 mph headwind gust - if there were not enough snaps I would most likely experience a catastrophic event (not to mention crapping my pants and dealing with the Wifie's soiled nylons). So all I can say is that you can never have enough snap fasteners (plus they look sexy on vinyl).
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The other issue I had was the nagging sag of the vinyl from the headboard corner longitudinal to the center bow corner arch. This is very eye catching, sagging in a convertible top.
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So I took out my trusty slide rule and pencil and after some mathematical figuring out the coefficient of vinyl sag when combined with span and track and changing radius of two arches, and a bit of head scratching and ear pulling I made a pattern. Transferred this to the PS and DS of the top, basted the seams, committed sewing fabrication, 1/2 Felled the seam, and there it was! No more sag.
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Lastly I started adding some rear snaps. These are reinforced with facing tape which will be sown into the perimeter seam so as to lessen the tension stress on the snap fastener.
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Ad if you believe all that bs about the mathematical figuring , I have some ocean front property to sell you in Holden, Alberta (all I did was took some binder clips and pulled the seam in on the inside, clipped it with about 20 binder clips, while the top was on the car until it looked presentable, marked it, traced it, transferred the pattern to construction paper, copied it to both sides of the top and sewed).
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Just like snap fasteners and angle grinders, you can't have too many binder clips.