hubo

All, I have recently picked up an AH250 (GP11 MK.V) in pretty good condition except the 2 switches used to activate the 2 presets (Graphic eq. and Middle cut pre-shaping) that dont work at all. The 2 switches are dead in the sense that the tiny bit that creates a contact between the switch poles at the tip of the white plastic part has completly gone. I can live like this, as the presets can be activated with the footswitch but I would like to fix this. Anyone would know where I could find standard replacement parts for those switches or an alternative that can accomodate the green buttons? Thanks! H