I had the same problem with trying to get mine off my 90' Camaro and with the tab out it would not come off. I gently tried prying it off and this did not work, then I used a pneumatic grinder with a cut off wheel and started to cut from the top down just before you get to the spline where arm attaches and then with a flathead screwdriver insert the tip into where you cut and this will split the metal of the arm and it pops right off and the exposed spline is fine. I applied a little lithium grease to the wiper spline and when I installed a new wiper,it went right on. Hope this helps you out. Good luck!
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