Hole placement

HI, When it comes to drilling the 3 holes on a .437 B.C. for the cocking knob in the Breech Back Plate, How can I mark or drill them 120`apart? The knob doesn\'t have through holes to transfer them. Did you guys make a jig at the same time as drilling your knob for those holes?

Thanks,

bruski

 

[attachment=9452:RG-G Gatling Gun 002 (Small)-id=818.jpg]

I picked up the center hole and trigged out the bolt pattern for 120 degrees on a .437 bolt circle.

X.2184 Y.0
X.1094 Y-.1892
X.1094 Y.1892

Hope this helps.

Thanks for the help. I managed to get it done ok.
bruski