Hi List, most people who are new to clockmaking are eventually faced with the maths that has to be mastered in order to complete a project. Don't give up, just remember that a librarian can not know every subject in her care but she can direct you to the right isle so you can find the information for your self. Same in clockmaking, there are loads of little calculations that at first seem daunting. Take each one at a time and an hour with the calculator will see some light at the end of the tunnel. Dave