This popular devices slows the tuning rate of the TS-940 from the standard 10KHz per rotation to as slow 1.25KHz per rotation. No soldering required. Installs in a few minutes with just a #2 Phillips screwdriver. Allows much easier tuning of CW and digital signals. Unit looks like new. $30.00 + $5.00 shipped Presently sells new for $49.95. Don AF4Z