For skully caps our favorites in my bronx neighborhood were the plastic liquor bottle tops filled with some tar scraped out of the street; or the metal cap from the bottom of the school chairs legs that made the chairs slide on the floors.

The school chair pieces were heavy enough the you didn’t need to give it any additional weight, the only problem was the extreme difficulty of getting it off of the bottom of the chair leg. In all the years that I tried I don’t think that I ever got one off of a chair.