Hey Jim...Figured someone had to notice the handle! It actually broke off during that blizzard we had a couple of winters ago. It was being stubborn and I gave it a few taps with a hammer to get it locked all the way in. I sandwiched the broken off handle between two sections of steel stake and welded it up. That held fine until last week.
You are correct, there was a little base left under the washout. The driveway took about 40 yards, or two truck and pup loads. I usually figure 3/4" rock and road base just like concrete...length x width x depth in inches divided by 324. Gets it real close. I make adjustments for other aggregates. For example, pea gravel goes a little farther and with chat / screenings you'll need a bit more. Just so you know, 3/4" out of Chico is running 3/8" crush up to 3/4". Lays down nice and compacts pretty hard without a roller if it's not put in too thick.