Pop the old knobs off with a pipe wrench covered in electrical tape. Squeeze and pull upwards/away from the Yoto.

These replacements snap into place and are easier to swap back and forth.
Included STEP file and 3MF for Bambu Studio
Printed with a .4mm nozzle with .08mm layer height. Would be even better with a .2mm nozzle.
I had the best luck printing upside down with tree supports like this:
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Note - the little tabs can sometimes break off when removing the knobs. The knobs still stay in place just fine, but if you're concerned about very small children pulling them off and/or trying to eat them - you probably shouldn't use these.
The author marked this model as their own original creation.