Hi Mallinson,
Your electronic device is for your flapper only. It is NOT to be used on your pigeon magnet as you will burn the timer out!
As to the speed controller thread, I have found that in the summer time slowing the machine down does improve its pulling power.
Dont be tempted to use a resistor or longer wire to slow it down as this will cause your battery to drain faster, use a speed controller from UKSHOOTHOUSE these have circuit in them designed for the job that will not increase the battery drain and therefore gives you more shooting time
S.B