mine has held for 5+ years, but i can't remember what all i did. i know i used one of those lock nuts with the vinyl threads on one end and i think i used all stainless hardware. that window goes up and down a few times a day, since it's the only one in my car that moves. (ouch)

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1982 300sd from craigslist $800 greased on one tank with NO CONVERSION in the Hot Texas Sun. (currently dead & awaiting engine damage investigation and/or longblock swap)
new daily: '03 vw 5speed jetta tdi wagon. bagged&chipped