Need to identify small round plastic switch

[vjekobalas]

There are two of these switches on a MedContour ultrasound
head (machine made in Italy) - would appreciate if someone
could give me some direction as to who makes them/where
I could buy them as one of them seems to be going out of business
- much less spring to it than the other (guess due to constant use
and oily environment).
The switch is all plastic, between the pins is
a hole (I initially thought of pneumatics  )
Underneath the switch we can see the letters PA
on one side of the pins and a symbol on the other side of the
pins.

It was glued to the plastic hand piece I guess I can silicone
it when putting it back or should I use some type of glue
(ultrasound hand piece is plastic) ?

[free_electron]

that S logo could be shaffner.

[inse]

Schurter!