The right tool for the job...
Ullman has been manufacturing small hand tools in Ridgefield, CT for over 76 years. You don't survive in a market that obsucre without being good at what you do. I'm sure you can cheap out and find something on the internet for about 99 cents that will do the same job...but the handle will be too small, the tip will bend, or the pick will just fall out of the handle. Ask me how I know.
I'm often tempted to use the wrong tool, either because I don't own it, or because I'm too lazy to walk across the shop to get it. I can help you with the former but you are going to have to work latter problem by yourself.
Changing o-rings (and not scratching or dropping your light) is a breeze with this little gem. Once you have it I'm sure you'll find all kinds of other (sometimes inappropriate) uses for the o-ring tool as well.
This is the same o-ring tool I use in my shop and I'm not going to sell you anything less than the best, but you probably already know that by now.