[HAM] springs percussion box

[Jeroen Jongejan]

Hello group,
Is there an alternative for the little springs in the percussion box? 
[i.e. M3] I did not realize their importancy and pulled them out too cruel.
The two heaviest switches - on/off & 2nd/3rd - have stopped working
well and stay in a 'neutral' position.
Maybe someone knows a better alternative or can i buy them somewhere?

Thank you,
Jeroen (Netherlands)