Folks, we used these at Boeing [link=http://homeavcables.com/900-005.html?productid=900-005&channelid=FROOG]cable tie gun[/link] this little sucker will get a zip tie tight enough to cut that little silicone tube in half. Thankfully they are adjustable, they even clip the excess off once it is tight. Just so happens I have one at home I use for my ties I never have lost one of the deflectors.

The ones for the aircraft industry are of course some over priced $600 FAA approved, wonder why a airline ticket cost so much thing. I found this one works just fine.

(edit: I got mine from best buy, a few years back dunno if they still have them or not )