I recently (December 2025) bought a traditional piano bench, and it was too short (too short for me, and shorter than the advertised height). So it needed modifying before I could use it properly.
The piano bench legs had some hard round plastic feet fitted to them, you might call them floor protectors, but I'm more inclined to describe them as protecting the bench's wooden legs from splitting at the edges (taking the weight in the centre of the wood). They have a projecting peg that's wedged into the wood in a tight hole, they're not glued. Nothing wrong with that, they do the job, the point being that it's not difficult to remove them.
I looked at various options in the hardware store for making the legs a bit longer. There were three viable solutions:
Attaching some rubber feet (actually door stops, since they were the only things big enough), and there were two sizes in black rubber that were reasonably close to what's needed, and kind of look like they'd belong there as feet. But I decided against that, as there's a good chance they'll leave marks all over the place (like the black rubber backing of our doormat that's supposed to protect the carpet from muck from shoes, but actually mades a worse mess by itself that probably can't be removed).
I'd looked at some others made from white rubber, they shouldn't leave any obvious marks, but they'd be very obvious attached to the end of the legs (the rest of the bench is black).
Or fitting some adjustable feet (a threaded bolt goes into the leg, and you wind it in or out to suit). There were a variety that were close to the right size. Some with rubber feet, other's with plastic, I settled on some that are all‑metal with a black bakelite (plastic) coating on them (they're furniture sliders, allowing me to skid the bench across the carpet without it snagging). And fitting a T nut into the base of the leg as being more robust than screwing a metal bolt directly into wooden legs.
The original feet were worked out with a blade (they're just a tight fit). A longer hole was drilled through the original hole for the shaft of the adjustable feet's bolt. And a bit wider hole into the top of it to fit the T nut (which are hammered into place). Then the feet are simply screwed in by the amount needed to set the height (an inch taller than before, for me). I added another nut on the bolt, just to help things stay at the right height, and stay together with less rattles. Then I wrapped a ring of black felt around the shiny metal parts to hide them.
Now the bench is at the right height. The height I need, and the height the bench claimed to be (but wasn't).
I'm using this on carpet, with a squishy foam underlay, so individual adjustment of each foot height isn't very critical, but if I was on a hard floor these feet can be easily adjusted so the bench wouldn't wobble on an uneven floor. So that's an extra thing in their favour.
