Well, since I gave up on the saddle valve for punching I decided to just buy a dremel if I was going to be doing slots. Wow! What a difference from my drill. I had been using a drill with a rechargable battery and the battery is old and weak. I was having to recharge it after doing just one slot and it took a long time to drill. The dremel kicks out a slot in about a second. Vroom!
Now, I need to find other things to do with my dremel so I can tell DH that I didn't just buy it to drill slots in cartos. LOL.
Oh, it was pretty
cheap though.