What should you do if you learn your transmitter is producing key clicks?

Key clicks happen when a CW (Morse code) transmitter turns the RF signal on and off too abruptly. This creates a sharp square-wave envelope that generates wideband frequency transients, causing interference to operators on nearby frequencies. To prevent this, transmitters use a keying filter (or shaping circuit) to slightly round the rising and falling edges of the waveform. If your signal is producing key clicks, it means this filter has failed, or the amplifier stages following it are distorting the shaped envelope. Adjusting the physical key will not change the electronic shaping of the signal. Similarly, adding a choke to the RF output is a remedy for common-mode RF on a feedline, not for an improperly shaped CW envelope.