Jaegers 6" f/10 "GJD" OTA Construction - The Main Tube (cutting through along groove - 1)
 

Main tube being cut to proper size - 8. (Click to see an enlarged image.)

 
The hacksaw finally cut through a good part the main tube, as seen from the inside of the main tube in the photo above. Just a little while longer and I will have completed the cut all the way around.