The right-hand end of the lower spindle must be bent over (after slipping
on the distance piece) to form a 1/2-inch crank making an angle of 45
degrees with the line of the front, in an upward direction, as it will be
depressed by the opening of the shutter. Flatten out the end with a hammer,
and drill a small hole near the tip.
The shutters can now be placed in position, and the caps of the sockets be
screwed on. The next thing to make is the connecting rod to join the cranks
at the left side of the front. For this purpose we may use a piece of
fairly stiff strip metal--brass by preference--5 or 6 inches long. Half an
inch from one end make a mark with the centre punch; then measure off
exactly the distance between the shutter spindles, and make a second punch
mark. Drill holes at the marks large enough, for the disc screws to pass
through easily, but not loosely.
Attach the rod to the discs by the screws, and slip the discs on to the
ends of the shutter spindles. (The free end of the rod should be upwards.)
Press the shutters against the front so that they cannot open, adjust the
discs at an angle of 45 degrees to the front in an upward direction, and
solder them firmly to the spindles.
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