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[[File:Knobs to fit D and T18 pot shafts.jpg|thumb|right|150px|The fit of knobs for D and T18 pot shafts.]][[File:Potentiometer knob with set screw.jpg|thumb|right|150px|Knob with set screw on potentiometer.]][[File:258J_Rogans_Final.jpg|thumb|right|150px|Rogan knobs on a J3RK dual 258j oscillator module.]][[File:Davies skirted knobs as used in Buchla 100 & 200.jpg|thumb|right|150px|Davies Moldings skirted knobs as used in Buchla 100 & 200 series.]][[File:Cliff_K1C_Satin-200x200.jpg|thumb|right|150px|Cliff knob as used by EMS.]][[File:Intellijel_Knobs2-200x200.jpg|thumb|right|150px|Sifam knobs as used by Cwejman and Intellijel.]][[File:Black-1900h.jpg|thumb|right|150px|Davies 1900h knobs used on Serge, and popular on Eurorack.]][[File:TipTop Eagle 450-4010 knob.jpg|thumb|right|150px|Eagle 450-4010 soft touch knob, used by TipTop.]][[File:Mutable Instruments Eagle 450-BA761 knob.jpg||thumb|right|150px|Eagle 450-BA761 on Mutable Instruments panel.]]'''Knobs''' fit on controls, e.g. [[potentiometers]] or sliders, push button and [[rotary switches]].
== Use with potentiometers ==
T18 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.<ref>[https://www.muffwiggler.com/forum/viewtopic.php?t=54215&sid=0c1a5b9d1c9d353c1a8e025489dcf6ac knurled vs round shaft pots], Muff Wiggler forum, March 2012</ref><ref>Wikipedia: [https://en.wikipedia.org/wiki/Control_knob Control knob]</ref> Note that knobs to suit D shafts come with different pointer orientations.<ref>[http://mutable-instruments.net/forum/discussion/4065/shruthi-knob-specs/p1 Shruthi Knob Specs], Mutable Instruments forum, Oct 2013</ref>
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