Unless Scott's changed them, they're 1/2 inch holes. I used the switches listed about 1/2 way down this page - http://www.hotrodmotm.com/parts_list.htm
--- In ModularSynthPanels@yahoogroups.com, "andrewlistmayer" <andrewlistmayer@...> wrote:
>
> Hi, was just wondering: What size are the holes for the momentary switches on the Klee/MFOS seq panels? Any suggestions for what mouser part# would fit? Thanks.
>