Found this on another site, seems to know what they are talking about.
DON'T despur the chicks, wait until they're older - definetly DO NOT burn the spur buds off - even the girls get them, they just don't continue to grow like the boys' do. "For permanent removal, cut spurs off close to the leg when cockerels are 10-16 weeks old and their spurs are no more than 1/4" long. Rub potassium hydroxide into the wound to prevent hemorrhaging and to destroy spur tissue so the spur can't grow back. Trim the spurs of a mature cock in one of two ways: by snipping off the end and filing it smooth or by twisting off the spur cover. Beneath the old hard spur is a softer new one. If you choose to blunt the old spur by snipping off the end, take care you don't clip off too much at once or you might damage the new spur and cause it to bleed." When you're twisting off the old spur, rub oil into it first and on the leg near it to soften it up and twist, don't bend!