The axles on my st/300 don't have a bolt connecting them to the sprocket tube. It has a square end that mate with I'm assuming a square hole. My question is if I can't get the two apart and decide to cut them and make axles, how much of the sprocket tube is square? Is it all the way through or just the end. And would you drill a hole and use a bolt or make the end of the new axle square?