ジョグダイヤルの部分が基板から剥がれなくて破壊覚悟でやって破壊しました！
外し方は理解したので次からは壊さずに修理できます。
もう売ってないけど！

The jog dial portion wouldn't peel away from the circuit board, so I resolved myself to breaking it, and break it I did! I figured out how to remove it, so from now on, I'll be able to repair it without breaking it. They don't sell it any more, though!