Editing SMK J-M0404 series (section)

===Known variants===
The table below shows all discovered variants. There are far more possible combinations than have been discovered. For example, tall stem angled has never been seen, and the tall stem switches have not been found in the same number of varieties as short stem switches.

{| class="wikitable variants-table"
! !! Part !! Description
|-
| [[File:SMK J-M0404 standard -- variants table.jpg|175px]]                        ||  || Short stem, upright
|-
| [[File:SMK J-M0404 tall -- variants table.jpg|175px]]                            ||  || Tall stem, upright
|-
| [[File:SMK J-M0404 low friction -- variants table.jpg|175px]]                    ||  || Short stem, low friction
|-
| [[File:No photograph.svg|175px]]                                                 ||  || Tall stem, low friction
|-
| [[File:SMK J-M0404 angled -- variants table.jpg|175px]]                          ||  || Short stem, angled
|-
| [[File:SMK J-M0404 low friction angled -- variants table.jpg|175px]]             ||  || Short stem, low-friction, angled
|-
| [[File:SMK J-M0404 low friction light angled -- variants table.jpg|175px]]       ||  || Short stem, low-friction, angled, low force
|-
| [[File:SMK J-M0404 low friction light angled pale -- variants table.jpg|175px]]  ||  || Short stem, low-friction, low force, angled, pale version
|-
| [[File:SMK J-M0404 low friction light angled dummy -- variants table.jpg|175px]] ||  || Short stem, low-friction, low force, angled dummy
|-
| [[File:SMK J-M0404 low friction dummy springless -- variants table.jpg|175px]]   ||  || Short stem, low-friction springless dummy
|-
| [[File:No photograph.svg|175px]]                                                 ||  || [[SMK J-M0404 alternate action|Tall stem, upright, latching]]
|-
| [[File:SMK J-M0404 alternate -- variants table.jpg|175px]]                       ||  || [[SMK J-M0404 alternate action|Short stem, upright, latching]]
|-
| [[File:SMK J-M0404 stemless -- variants table.jpg|175px]]                        ||  || Stemless
|-
| [[File:SMK J-M0404 illuminated.jpg|175px]]                                       ||  || [[SMK J-M0404 illuminated|Short stem, upright, illuminated]]
|}

SMK-branded parts in this series appear on a number of websites, typically with bogus stock figures (as high as 65,000 per part), but attempts to determine any correspondence with known switches has proved futile. The following parts are confirmed (with corrections for transcription errors such as "(SHARP)" or "≠" for "#"):

{| class="wikitable"
! Part no. !! Description !! Source
|-
| J-M0404#01 || SWITCH                       || Abtronics
|-
| J-M0404#04 || Switches                     || Jotrin
|-
| J-M0404#05 || PCB Single Keys[witch]       || ISO Parts
|-
| J-M0404#08 || KEY SW MECH BTTM SEALED 5AMP || ICLocator
|-
| J-M0404#10 || PCB Dummy Keysw[itch]        || ISO Parts
|}

No Abtronics branches in any country ever respond to enquiries, and they have a high minimum order value; ISO Parts and Jotrin list bogus stock of nonexistent parts. Obtaining these parts may not be possible. Only J-M0404#10 may be identifiable, as it likely refers to the dummy switch sometimes found under space bars (e.g. some Type 2 [[Acorn BBC Microcomputer]] keyboards, and the [[SMK J-M 9031]] keyboard).

Abtronics also lists J-M0409#01 with description "REF.042R" and no manufacturer; it is conceivable that the angled stem or tall stem versions were covered under a related series, but J-M0409 series may not exist. Retroamplis sell [http://www.retroamplis.com/Boss-spst/en part JM-0404], intended for Boss pedals, which is a standard short straight stem switch. This apparently incorrect part number is derived from Boss, as noted in the [http://musicthing.co.uk/modular/?p=1113 Boss PS-2 Schematic] (under "SWITCHES", as JM-0404 "Key Switch").