For some reason the (4) 3/4" knobs came off by pulling up with my fingers. Those shafts are plastic.

However, the 14 rotary lighted knob shafts are metal. The knobs would not come off whatsoever & I almost thought they were built on or glued but knew that wasn't the case.

I did not want to damage the YC surface, the pots nor the original knobs themselves.

Like I always say, a zip tie can fix anything.

The tip of the zip tie is extremely smooth, pointed and tapered so I slid (2), one on each side, up under between the surface and the base of the knob.

The larger zip ties worked better although I started with the smaller ones.

You'd think after overcoming the friction they'd just pop off. Some did but about 1/2" were really grabbing the shaft for the full length of the shaft.

Once I got some slack on each end of the zip tie I pulled both of them upwards while pinching them them towards one another and pulled up swiftly.

Sometimes they would pop off completely and sometimes you'd move a little per pull and the ties would come off the edges of the knob.

A few I had to pry off resting the pry bar tweezers on the zip tie so as not to scratch the surface.

Once I figured this out I got them all off very safely without a mark on top or damage to the knob.

The only thing I can figure is that the pot diameter or knob are machined just a tad to tightly or the knob was made to grasp too well.

I'd prefer my knob to break or fall off rather than the pot or board get damaged if I were moving this around from place to place.

Mine stays safely in my studio so my metal knobs are fine being set-screwed in place.

Most people won't venture to remove/replace knobs but I said it anyway if you are that adventurous.