The ground signal were made from a MSE kit of parts. The same model was used below
the base board as with the normal signals, but this time the brass tube ended just
below the signal base pad and the control rod fitted into a hole in the white metal
lever arms. The same method was used to limit the travel as before, but it is more
important to get the operation working manually and to the correct limits as the
force of the solenoid will pull the brass control rod straight out of the white metal
and you can right-off an operating arm. I must have got through about 3 on each ground
signal before I mastered the correct procedures. The other end of the operating arm
was connect to a pin soldered on the reverse of the Disk to one side by a crank made
from 0.020” brass wire. The main problem here is that the main casting also limits
the amount of travel so to get realistic operation and the disk turning through the
correct distance some of the casting had to be removed. Once the travel of the point
motor is correct a small amount of super glue fixes the styrene in place.
A single ground signal - controlled from a point motor mounted under the board.
Construction of the signal actuating mechanism using a Hornby point motor