I've read about these and they seem like a good idea for places that I'd rather not weld. I don't have the tool, but they seem to be reasonably inexpensive. Does anyone have experience with these? Why would I rivet something instead of just using something like a self-tapping screw? Since I already have a welder, should I not bother?

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1983 240D 3.0T 4-speed manual, now sold

1989 Subaru GL Wagon 5-speed Touring Edition