Adding to what Mike said, if you've got noisy brakes, you're probably not getting proper brake pad toe or possibly even alignment - and with the old style pads, you may not have any adjustment.
Certainly scarfing the pads to shape is one way to correct it.
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A big advantage of newer cartridge pad designs is a spherical washer and/or a conically free stud that gives them varying degrees of adjustment.
Yokozuna makes somes nice (and cheaper) ones, which I have on my '57 Lenton with Weinmann side pull brakes, replacing the black pads from the photo above.(these are also 700C Synergy rims)
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(the black stripe on the rim was the truncated contact patch from bad alignment on the black shoes)
Aside from no noise, these cartridge pads when compared to the black originals made these brakes go from marginally scary (
stopping would be good) to more than adequate.
Though the spherical adjustment is limited on the Yokozuna cartridges, if it's close enough for your rim width and caliper travel, they self-align and self-toe with proper installation.
You can also adjust the caliper travel (closer parallel to rim) by shimming the shoes with M6 bellville washers.
The Kool Stop Dura II cartridges are on my '74 International with Weinmann center pulls. These cartridges have even greater spherical freedom, adjustment, definitely self-align and self-toe when you follow the installation instructions, regardless of rim width, and these brakes have all the power of my Paul touring cantis on another bike (you can't get more than lockup); though they definitely don't modulate as well as the fancy (and very expensive) cantilever brakes installed on my pro cyclocross frame (the Paul cantis will stop that bike from 15 mph in 4 feet - made that stop on the greenway today for a runner with earbuds coming my way and reading his phone -
Planet Earth).
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though I used belleville washers here, too, and looking at the pad stack from inside to out (l to r) are spherical washer, bellville, caliper, bellville, flat washer and cylindrical stud nut.
Bellville washers are conical spring washers that compress to flat as you tighten, and lock everything in place.
Also nice about cartridge pads, when you need new pads, you don't have to change your adjustment on the cartridge holders. You just back out the M2.5 in the cartridge holder, slide out the old, slide in the new and retighten the M2.5 set screw.
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