Install the bell push first. At its chosen position, drill a 6mm diameter hole through the door frame (1) or the wall. Pass a length of bell wire through it from indoors.
Drill a bigger hole if the bell push is a flush-fitting type with a barrel-type switch projecting from the back (2). Drill the larger hole first.
Separate the cores for about 25mm and strip 10mm of the insulation from each one. Remove the cover of the bell push and connect one core to each terminal on its baseplate (3). Then draw the wire back through the hole until the baseplate fits flush with the frame or wall surface, make pilot holes for the screws with a bradawl and screw it in place.
Fix the sounder baseplate at its chosen position. Then run the bell wire from the bell push towards it, clipping the wire every 150mm or so to ensure that it lies flat. When you reach the sounder, insert the wire through the entry hole. Separate the cores and strip the insulation as before, then connect the cores to the sounder terminals. Fit the batteries (most use four 1.5 volt cells), test that the unit works and fit the sounder cover.
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