The best sound results from shortest signal path. So let’s keep volume, selector and signal wiring to/from inputs/outputs short and at the back of the chassis. That means shaft extensions are needed.
Have you ever tried them? They do the job BUT poor tactile quality. The problem is the way the shaft connects to the switch.
But the Uni-Flex Joint solves this: as it turns it adapts to the angle of the rotation axis and provides some mechanical decoupling from knob to switch.
The shaft is 240mm long x 6mm diameter. You can cut it to length. Solid aluminum.
1 Uni-Flex Joint
1 switch mounting bracket with adjustable height 10 – 50mm and positioner slot.
1 aluminum shaft as described above