Im thinking two pieces of heat shrink tubing over the wiper drive blade then cut a hole in it for the tang. Shrink until a sung fit is achieved That stuff is very robust and wont fall off during assembly. Wont be seen either.
If it can take the abrasion of the wiper motor changing directions, then it sounds like it would work. But the Garlock material held up for 40 years in mine and the cost was negligible since I just used a small scrap piece of leftovers.
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