I wouldnt be surprised to see Felder to come up with their own pneumatic locking device soon?
This is how the pneumatic locking/unlocking is done on my SCM?
It never gets too cold over here, daytime temp never dips below 5 deg Celcius/40 deg Fahrenheit, and rarely goes beyond 30 deg C/85 deg F, annual average is 20 deg C/70 deg F
Albert Lee