Only took me three years to think of it.... Previous owners refloored the house with thinner material, resulting in a lot of doors and door trim being further from the floor than one would want--in particular sliding doors, which are a full inch off the floor, too far for the guides that could keep them from banging.
Suddenly realized that by lowering the track the doors hang from, I could fix this today for less than $10.
It reminds me of Utah Phillips' story about the old mule wrangler ...
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Shorty had a pack mule and ran supplies out to prospectors in the Utah canyonlands. The trail passed under a natural stone arch, and when the mule's ears brushed the underside of the arch, it would balk.
So one day Utah Phillips finds Shorty standing on a ladder chiseling away at the underside of the arch. "Shorty," he says, "don't you realize you could just take a shovel and lower the trail a little?" Shorty gives him a disgusted look and says, "Ya dern fool, that's not where the problem is!"