Jaegers 6" f/10 "GJD" OTA Construction - Main Tube & Lens Cell (alignment - 1)
 

Close-up photo of Rear Lens Cell drilled for attachement to Main Tube - 6 (Click to see an enlarged image.)

 
Showing the mark on the rear lens cell, to which will be used to align the unit to the filed mark on the main tube, the image above displays holes that will be utilized for attaching it to the main tube (bottom hole) and the dew shield (top 1/4 x 20 threaded hole) rear lens cells.