Fixed my sticking upper playfield flipper... I don't remember there being any posts on here about it before, so here's a quick synopsis and what I did to fix it... thanks zaphX for putting me on the right track and helping me through.
Basically, I noticed during gameplay that it didn't look like my upper pf flipper was returning all the way "home," and then sometimes it stuck all the way up, and I even got a ball stuck in the cutout beneath it. I raised the PF and the flipper traveled free and easy, until I put a little pressure on the top of the flipper (mimicking gravity), when it stuck/binded. zaphX suggested I check the coil plunger, and that indeed turned out to be the issue. The weight of the flipper and shaft put enough downward pressure on the linkage to make the plunger askew as it tried to travel in and out of the coil, causing the drag.
Tried just lifting the shaft some more, but the weight was still there of course. Looking closely, I noticed that when I slid the flipper shaft down as far as it would go without dragging the playfield, there was still a small gap between the sleeve on the flipper assembly (which comes a few inches out of the playfield and to the bottom of the upper PF) and a spacer sleeve that sits on top of it, meaning that unless the flipper were lower and sitting right on top of that spacer sleeve, the flipper isn't being supported by anything but the pinch clamp on the flipper assembly... and that weight being on the pinch clamp was the reason it putting pressure on the linkage and plunger. I use too many words.
So I just needed to make the weight rest on the spacer sleeve so it didn't torque the shaft and put lateral pressure on the flipper linkage. Luckily, I have about 6,000 PETG washers sitting around now, and they are about the right thickness to let the flipper rest on the shaft spacer. I took a 3/4" PETG washer and drilled out the hole with a 5/8 bit, which made it big enough to fit around the shaft. Then I just loosened the pawl nut, spread the pinch clamp a little with a screwdriver, removed the flipper and shaft, slid the washer on it (3/4 inch is the perfect size for the radius of the flipper), slid the spacer back on, and inserted it right back down. The height was perfect, I just retightened the pawl nut to get that pinch clamp semi-tight, made sure I had a little vertical play on the shaft, put the flipper in its position over the playfield, and tightened the pawl nut the rest of the way down. Swings free and easy now, returns to "home" without issue, and I'm back in business.
I hope no one else has such an issue, but if you do, it was pretty easy to deal with. PM me if I didn't make enough sense and you need help.
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