It was time. The old pencils are gone. It’s impossible to keep these babies sharp enough to fit all that’s needed on small scale graph paper… the erasers are always used up before the pencil… and they’re annoying. Sorry, but they are.
So, I’ve moved on. Lots of mechanical pencils. Math is easier when it’s neatly written. Mistakes are caught more quickly. A few of the better brands of normal pencils are still around, but most are gone.