These are the Selmer K Modified Trumpet shots before the operation.  The first valve had a key already to operate the tuning slide but the third had nothing but a ring.  This meant that the player had to squeeze in to operate the first slide and push out to operate the third.  This is not a natural movement, so I made a trigger for the third valve as well.  This way, the player squeezes for both slides.  Alternately (and slightly cheaper), this operation can be done by just removing the first valve trigger and adding (permanent) rings to both slides, but the owner really liked his trigger.

Here are some shots of the first valve trigger.  I based the shape of the new key off of this one and then changed the shape as needed to fit the third valve.

Here are the shots of the new key.  The tubing exited the valve differently than the first valve so the key need to be bent to the side to operate.  The finder pad portion of the key was originally a mirror image of the first valve key, but was found to be quite uncomfortable for use with the index finger, so I made a larger pad out of nickel silver, then shaped and angled it to make it comfortable for the finger.  The stud connecting the key to the slide had to be moved up to one of the slide legs because the main tuning slide would have prevented access to the screw.  All parts of the key were made by me except the screw attaching the link to the slide stud shown in the last picture (Horn players will recognize that as a stop arm string screw from a Conn 8D).

Here is a shot of the finished instrument.