Jaegers 6" f/10 "GJD" OTA Construction - Main Tube Prep (filing drilled holes for lens cell - 1)
 

Filing final sized holes drilled in Main Tube to receive Lens Cell - 3 (Click to see an enlarged image.)

 
After the three holes were drilled to size, I filed away the burrs in line with the main tube with the flat face of the file to make them nice and smooth.