This is a great site.I am so happy to see that someone has started to compile the rules and variations of skulley ( what the game was known as in flatbush,B’klyn during the 70’s; friends from bensonsonhurst and e. ny call it skellsey).I do remember the parks dep’t putting in a few skulley boards during the late 70’s ( because we kept carving into the soft tar).And, as for standard size ,I think that usually depended on the playing field ( street, park,sidewalk). You were only allowed to use “cheats” (i.e.-catholic school desk glides,lead, coins, rocks, caps from non beverage bottles i.e.-extra wide cleaning bottle caps) as long as everybody had a tricked out cap. The caps were picked out by how flat and heavy they were ( a cap that was from a hard to find product or a discontinued style wer always prized). The next step was selection of material to be inserted into the cap(tar,crayons,lead,coins,prayer candles).Crayons always were the preferred method because of how cool looking the cap would come out. Next you would melt it ( radiator was my method, Mom wasn’t too happy about the psychedlic patterns it left). Then you would spend an hour grinding it smooth on a sidewalk to make it ready for play.