@rauliruegas Appreciate the numbers from Vinyl Engines calculator. I used to have an account there, and then one day I could not log in. Never could reestablish access to it, nor make a new one.
The arc protractor program I used was Conrad H one, as it is reported to be an acceptable one. The system only allows input of spindle to pivot and the print ratio is 1.0
What is odd is the numbers do not match up. For Lofgren B as example the overhang is 16.8 mm, but the inner and outer nulls are slightly different. 57.4 and 114.8 and an offset angle of 22.4 If the program is using the same calculations I would not expect such a variance in numbers.
With what the Vinyl engine calculator shows, I think I will order an Accutrak arc protractor for this arm.