Hi,
I made my pedal board contacts with magnets and reed switches by
www.respotec.de/shop/index.html (see 'Reedkontakt' and 'Magnet') and the midi interface
www.doepfer.de/ctm.htm.
As switches I took the type MK4-1A71-B after having broken many of the tiny glass tube types.
I recommend not to choose strong magnets (like I did), because they often keep also the neighbour switch on when sliding from one tone to the next. So I had to cut some of them.
The MK4-1A71-B reed contacts have two holes for M3 screws. They are easy to fix near the pedal key end when pressed down. I fixed the magnets at the end of each pedal key by sawing a small slot into it and mounting the magnet with hot glue. A better solution is to choose a round magnet type so it fits into the according hole.
Try out the best switching position(s) and magnet distance with an indicating instrument before mounting both.
If you like I can take some pictures.
My pedal board was from an old Dr.Boehm organ, i.e. it had those old very thin steel contacts. After connecting them to the midi interface and testing it I decided to replace the old contacts by the magnets and reeds because they work truely safe.
Happy midifying.
Günter