Carton 100mm f/13 "MD" OTA Construction - Main Tube (Cutting to proper size - Step 2 of 5)
 

Completing cutting of the main tube to the right length with hacksaw. (Click to see an enlarged image.)

 
After the groove was etched, I reattached the hacksaw blade to its handle, removed the card stock from the tube and continued cutting along the etched groove and rotating the tube as I progressed. Eventually, I penetrated the main tube and continued cutting around its circumference.