weekly imponderable:
new product: SchmartBoards - easy to solder Surface Mount prototyping break-out boards, even .4mm pitch, QFN and BGA.
Curious Inventor - Store: Knob - Black Plastic / Metal Face 1.31" diameter
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in stock - price: $1.59
Knob - Black Plastic / Metal Face 1.31" diameter
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short description:

.87" tall

more information and instructions:

These are the knobs we use on our Voice of Saturn Kit.

Fits over standard .25" potentiometer shafts.

RoHS Compliant by exemption.