I'm a big fan of the John Wayne can opener, and have at least a dozen scattered about my various kits. I've found that after using one a few times, the blade doesn't stay folded. this wouldn't be too much of a problem except the one on my keyring tends to get snagged on stuff. Until now i just dealt with it, but a few minutes ago I cut my thumb open on it. So i just thought i'd give a heads up to all those who have one on their keyring.

I carry one on my keyring and keep the blade secured with a bandaid. The cushion part of the bandaid keys the blade in place and also keeps the hinge from snagging on stuff.

-Blast

I just put scotch tape around the blade, probably placed much like Blast's bandaid.

I have one on my key ring; it’s been there for 35+ years. About 3 or 4 times a year I get poked in the leg by it when it gets flipped open. Never got cut by it. Not a real problem or me.

Chuck Norris used to carry John Wayne's P 38. The Duke let Chuck do the bleeding.

I think in Chuck's hands that P-38 could be an AWESOME weapon!!

... but the bandaid would have to come off first.

On second thought I think Chuck Norris could kill someone with a bandaid.

I use a rubber band

I carry one loose in my pocket and after getting poked in the leg a few times, secured the blade with a small piece of heat shrink tubing. Works well and can be easily removed and replaced as needed.

I wrap mine with this (orange) tape. Stays on, never leaves a residue and easy to peel off.

http://www.identi-tape.com/carton-sealing.html

I feel like I'm missing out on some exclusive can opener club...

The P-51 society.