Ozzieman, sorry to hear you just discovered it.
I've used them since about 1980. I wasn't even an old fart then. Unless you are an ultra-human the tool is worth its weight in gold. Good of you to bring it to the attention of folks. I never gave it a thought to. You need a picture! ...I'll help.
In fact maybe this ought to become the official "Ozzie's Tools for Old Farts Thread"!
For old tired dim eyes there's
one more indispensable product...Meanstreak. From your office supply store.
click on picture below...video. (Hmmm, what's that in the background)