My wiper didn't fully lift off the glass (or park) when it was turned off. That meant any time I used the wiper (on purpose or by accident), I had to walk around back and manually lift it before lowering the rear window (can you say PITA?). There is an angled piece of plastic screwed to the rear of the shell that catches a plastic piece on the wiper arm that is supposed to lift the wiper off the glass. I found that it didn't lift the blade high enough to clear the lip of the fiberglass shell. So, I took a thin nut and beveled it on a grinder and placed it between the angled plastic and the shell. This gives perhaps 1/8" (3mm) extra lift and (red arrow in the above image is pointing at the gap the nut creates between the back of the shell and the plastic piece), more importantly, steepens the angle of the ramped piece. I put a little silicone grease on the plastic pieces and now the wiper reliably lifts off the glass. This is really nice feature to have working in snow country as it keeps the wiper from freezing to the glass.