Sometimes I crack myself up, and this weekend was one of those times. Not because I’d made some witty remark or observation, quite the contrary. On this occasion, I unleashed my inner knucklehead.

For several weeks, my youngest daughter has been asking me if I could build a tetherball pole for her. Nothing fancy, just your typical portable model made from and old tire filled with concrete. We’ve all seen them. You roll it out onto the driveway to play, and roll it away when you’re done. It’s a pretty simple piece of engineering.

Determined not to let this turn into another treehouse episode, I said “Sure, no problem!” and made a mental note to follow through this time. Last week, I was at the tire shop for a rotation and balance, so I asked if I could have one of their throw-away tires for the project. “Of course,” he said. “I’ll bag one up and leave it in the back of your car.” Our project was officially underway.

On the way back from a soccer game Saturday afternoon, my son and I made a detour to Home Depot to pick up the remaining items – a section of pipe for the base, another section of pipe for the pole (removable for storage), some miscellaneous hardware and of course, concrete mix. The tire they gave me was pretty big, but I figured four bags of concrete would be about right.

Back home, we started right in. The first task was to cut a section of plywood to act as a “plug” for the underside of the tire. Once that was in place, we were ready to start mixing the mud. After hand-mixing and pouring all four bags of concrete, there was still room left in the tire, and the embedment of the pipe sleeve was less than I wanted. I needed two more bags of mix. We made a mad dash back to the hardware store, and were able to return before the concrete started to set. Those last two bags made all the difference. With the tire filled to perfection and the sleeve securely in place, there was just one last thing to do. As any kid will tell you, no concrete project is done until the handprints are made. Check.

We left it overnight to cure, and went out to inspect it the next morning. I have to say it was a work of art – a quality project, just like we’d imagined, delivered on time and on budget. I was feeling good, and my daughter was brimming with joy and anticipation. So . . . what’s the problem? Well, the problem is that I failed to do a little simple math: Tire – 15 lbs. Six bags of concrete – 360 lbs. Twelve gallons of water to mix the concrete – 96 lbs. Steel pipe – 10 lbs. Grand total – 481 pounds! I can’t move the damn thing!

Like I said, it’s a piece of art.

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