Quote Originally Posted by johnnywalker View Post
I use a small saw blade for an I (1), a small triangular file for the V (5) and a round file (like a power saw file) for a U (10). I mark the wooden or plastic flap the dark slide slides into, and the marks come out on the edge of the film (if I loaded it properly). So UVII would be number 17.

Thanks for that ... (rattling sound as Kent rifles through tool box looking for kit with variously shaped little files ...).