Glen, what an exceptional job you have done in explaining and demonstrating what seems like such a difficult and complicated job! You have made it so understandable--because of your efforts, I think I can do this! Thank you so much!
make spiral, and then make more stairs about four times , we can go up second floor. and i don`t understand how you determind 11inch 11/16 . you used mathmatics I don`t understand.