I can't show an actual photo, due to company confidentiality policy, but I'm attaching a drawing that might clear it up some.

Thank you regarding avoiding G41/G42.  That was what I was thinking.  I can write GCode that could increment a # variable or a lua dialogbox that allow the user to input new values.  A this is a single use machine it shouldn't be a problem.

Okay, if you can write code then all you need to do is add a #var to your code.

# Numbers for the tool diameter offsets start at 13000 + the offset number so D2 offset would be #13002

Then you remove the G41/42's and you add something like this G01 Y[#13002] F1. or G01 Y-[#13002] F1. in your code.

Your code will look something like this :-

g0 g49 g40 g17 g80 g50 g90

g04 p2.
g53 g00 z0

M03
M08


G54 g00 g90 x0 y0.01 a0
z1.
g01 z-.25 f10.
y-[#13001] (offset Dia1)
a720. f2000.
x0y0
y[#13002] f10. (offset Dia2)
a0. f2000.
Etc......

That's great, I didn't realize the Diameters were a #var too! 
Thank you!