Photo 1 shows the Radar scanner parts obtained from MMB (ebay) for the princely sum of ONE POUND !!!!! plus 28p postage, and construction is of a medium soft resin that isn't prone to breaking or splitting when shaped or drilled, and a short length of 2mm brass rod becomes the drive shaft. This particular unit has a 44mm sweep bar but there are many other sizes available
Photo 2 shows the drive motor which operates on voltages between 1.5 and 6v, ideal for the control driver which is the next item. Available from saih.tan on Ebay for under 7 pounds, and if the motor is mounted on a removable bracket as I have done, this unit can be used in several models without the need for major 'surgery', the motor and radar shaft being connected with a short piece of rubber tubing
Photo 3 shows the receiver driven radar motor speed control which operates from an auxiliary receiver channel and takes the motor voltage from the main receiver supply, thus obviating the need for a separate supply and switch.
This unit is available from www.mr-rcworld.co.uk and costs a staggering 14.50 post free sheesh !
I must add here that I am in NO way connected to any of the suppliers mentioned here, but just though some other modellers may be interested in 'home brew' accessories and suchlike.