Any question answered...

That's because we'd already learned about the danger of sharp things from these fuckers:

Look pedals used to come with 6 of these (M5 threaded) in the box with the cleats.

Also, we had been trained for years with a hammer and a dozen small nails while putting slot cleats on wood soled racing shoes, so our manual dexterity was a bit better.

Where do you buy them from?