i am working on my build and i need sight glasses the most cost effective method i can think of is to thread the poly carbonate. on the web sight it say's that it machines easily, the tube is 9/16 id 11/16 od AS CLOSE TO ACTUAL PIPE DIAMETER AND THICKNESS I COULD FIND. i plan to take it to home depot and have them put it on there threader, any ideas befor i order the tubing?????