Hi,
I have done what you said and is absolutely great, in fact I could not work out that I should only remove the G0, what I tried before, was removing the all line N644 and of course the part end up even worst.
Now is perfect, you have done a good job and of course a great help, you must be very knowledgeable with Mach3.
Regarding the post processor on Mastercam I do not know, after drawing the part and give all details for machining I press a proper button on Mastercam and it generates itself the G code, what I can say to you is,
the extension is .NC and shows FANUC on a little window that´s all I can tell, sorry I am a new comer on this matters, I hope you understand these details I am giving you.
The part is a small horn for air modeling purposes which will be attached to a servo with a metal link.
Once again, thank you very much for your concern and prompt help, I am jet model pilot, if you ever need any help regarding jets and turbines please do say something and I will be very glad to help you too.
Best regards.