Water Keys ~
Many of our Callet trumpets are equipped with Amado water keys, a longtime industry standard. In our testing, Amado keys provide a more consistent blow as well as improved intonation over standard spring and lever water keys. WD40 is an excellent lubricant for these valves. WD40 acts as a water repellant as well as a freeing agent.
Periodically, rinse your tuning slides thoroughly while pushing the valves to an open position. Confirm that no slug is interfering with their function. Air-dry completely, then spay periodically with WD40 for years of trouble free use. If water is not exiting properly then insert the extended end of a paperclip to free any accumulated yuk. On occasion, Amado keys may require disassembly and a more thorough cleaning by a qualified technician. You can attempt this cleaning by yourself. Tip - remove the C-clip inside a plastic bag so you don't loose the clip. Otherwise, it is likely to fly free never to be seen again.
More recently, Callet Sima and New York Soloist trumpets plus all Callet Grand Prix flugelhorns feature Pollard water keys designed by valve technician Jerry Pollard, and very precisely machined by our long time friend, Jason at Harrelson Trumpets. In our testing, Pollard keys provide comparable blow and equally improved intonation as Amados. Yet, they are much more easily serviced. Just unscrew the cap with a coin, remove the plunger and spring. Then clean, lube, and reassemble.
Important - The water release port on all current Pollard keys is at the beginning of the push. Therefore, only push the valve about halfway. The appropriate stop-point is easy to feel. Any further and you can inadvertently deform the metal plunger. The plunger then requires a mild buffing of the deformation. Adhere to the "halfway only" to avoid this temporary inconvenience.
Also note - If you get an undesirable clicking when using your Pollard keys then disassemble the key and reverse the spring. The machining is extremely precise. In our experience, this simple adjustment often provides even more quiet action. Your ear will tell you which spring direction is best.