I bought a FVB MkII Shortboard used and when I try to toggle between Wah & Volume it does not work. After reading many post I understand that it is not always easy to push the toe switch. Looking under the pedel it appears that some may be missing or broke. There is a sharp/shallow indention on the metal pad/switch that indicates, to me, that something is missing. Any suggestions?

Max forward position:

Max open position: