If my brakes are squealing, they do not work very well because I will only gently squeeze the lever until I turn around, get back to the garage, adjust the toe in, and try again. I've never had more trouble with Mafacs than any other vintage brake wrt squealing. A course Nicholson is my usual go to and there is plenty of material on vintage brake blocks.
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I don't do: disks, tubeless, e-shifting, or bead head nymphs.