The knob blocks are no longer available but, if you're desperate, all isn't lost.
1.
Disassemble the X3 and move the PC boards away from the front panel
(see "Full Story", above).
2.
Get a Dremel® rotary tool with a tungsten-carbide cutter
accessory.
3.
Enlarge the hole so your
finger can reach through and operate the tactile switch.
4. Burnish the hole's edges and clean up all the metal shavings.
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