That would be 9/10ths O/C, and you can't divide the coin into ten parts of that width. 75%(four parts)-80%(five parts) is more accurate. ~ Chris
Thanks cpm9ball. Sounds a little more complicated than just eyeballing it? Wondering if they make a grid chart for noobs.
Actually, I do "eyeball" it, but drafting and mechanical drawing were hobbies of mine for 50 years so I'm used to it. I don't know if you'd want to go out and buy one, but they do make circle templates made of plastic with all different sizes shown in inches and millimeters. You would probably have to print grids out yourself, and it may be more trouble than it is worth. How often do you think you will need it? ~ Chris