Tuning pegs for musical instruments are commonly made from ebony or boxwood, but in medieval times and renaissance they would also be made from roasted maple. Maple is a relatively soft wood, so the trick is to roast it, which makes it very light and porous, and then let it soak in a mixture of linseed oil and turpentine overnight. It soaks the oil in like a sponge, going from swimming on the surface to sinking to the ground when it's saturated. The oil hardens and reinforces the wood, kind of like epoxy stabilised wood.
I'm going to have to try this! Very curious about just how hard it turns out to be in the end.