The early ones had a small roll pin driven thru across the lever shaft. It engaged under a stiff piece of wire in the windshield header receptacle. With too much air pressure at the header, the wires would deflect up, the roll pins would lose contact and the top went sailing.
In my new '93, I hit a hundred or so with the top on a few times. But I was already hearing of failures so I didn't do it very often.
Mine has come off at 75. At which point it was never ever used again. Model year 94. Autoform to the rescue. But making a statement about precise speeds is nonsense. Prevailing winds, and gusts, etc. c’mon
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