Knobs

Knobs fit on controls, e.g. potentiometers or sliders, push button and rotary switches.

Use with potentiometers
Splined push on knobs fit splined pot shafts. Pots with with round or D shafts require knobs with plain holes that if not push fit, have set screws to hold them in place. Most spline shaft pots have a slightly smaller diameter shaft than round or D shaft. Usually splines are 6mm while most round ones are 1/4" (6.35mm). So 1/4" setscrew knobs will end up slightly lopsided when tightened onto a 6mm spline shaft. Knobs fastened by a collet require a box spanner to fasten them.

MU
Moog style "fluted taper skirt" control knobs also used by Synthesizers.com, STG Soundlabs, etc. are manufactured by Cosmo Corporation. Available at:
 * Synthesizers.com, Parts
 * Bridechamber, Knobs

EMS
The EMS VCS3 knobs were made by Cliff Components, part number CL1606. Available in two sizes, the cap insert was satin or shiny silver, or with any of nine colours. Cliff no longer produce the knobs with coloured inserts. Available at:
 * Thonk, ‘EMS’ Style Knobs
 * Bridechamber, Knobs

Aries, Macbeth, Modcan B
Aries modulars used ridged knobs which these days are mainly used by Ken Macbeth and on Modcan B modules.

MOTM
MOTM uses ALCO PKES90B1/4 knobs. Available at:
 * Bridechamber, Knobs

Buchla
Buchla synths use Rogan knobs, and also Davies Molding knobs on 100 and 200 series modules. Available through group buys at Muff Wiggler forum or at:
 * Mouser, Davies Molding small: 5164-1610AA
 * Mouser, Davies Molding big: 5164-1600BM
 * Thonk, Davies Skirted Knobs

Suppliers

 * Knobs, Thonk
 * Knobs, Strings Direct
 * Knobs, Small Bear Electronics
 * Knobs, Tayda Electronics
 * Knobs, Das Musikding
 * Tuning knobs, OKW Gehäusesysteme
 * Knobs, Rapid Electronics
 * Knobs &amp; Dials, Mouser Electronics
 * Control Knobs Index, Surplus Sales of Nebraska