[sdiy] optical retrofit for minis?

[david at therogoffs.com]

/key (2 reed switches + magnet).
> 
> I worked on one old Hammond where somebody had removed the original pedal 
> actuators and installed reed switches for some aftermarket bass feature.  The 
> problem with those is they break...
> 

I don't understand why they would break.  They are very tough.  Of course, if you hit the glass casing with a hammer...