The short 2-position LG switch is our part number 495825. You may have a slight problem removing the Dress Nut on the current switch since it requires a special tool that fits in the slots. The Dual Rate switch is our part number 495924 and it is soldered to a pc assembly in the TX. Note that the round switch cover, p/n 492833, pushes on to the D/R switch. Yours may have a part of the D/R switch broken off in it. You also must remove the LG switch before you install the other switch since the LG switch is in the way of the pc board. Both switches are available at the Hobby People web site: http://www.hobbypeople.net/
If you need further assistance please call us.
Airtronics Technical Support