Jaegers 6" f/10 "GJD" OTA Construction - The Dew Shield (groove cut around tubing - 1)
 

Dew Shield being cut to proper size - 3. (Click to see an enlarged image.)

 
After cutting the initial groove at a good depth without completely cutting through the Dew Shield, the card stock guide was removed. In this close-up, you can see how smooth a cut the hacksaw generates with this method. As I said before, it is a slow process, but well worth it if you do not have better tools.