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Testing the prototype
delivering to you is a prototype, not completely functional nor
immediately substitutable with the old heat switch. We ran into some
problems on this end that we should explain.
1. The base
is asymmetric because we left room for a pin stop on one side that we
thought might be an added feature to prevent jamming. We never actually
added this stop.
2. We ran
out of gold sputter halfway through our sputtering, so only one side of
the contacts is coated with gold, and there was no way to get more gold
before the project was over.
guides on either side of the heat switch should either be press fit on
one side or have snap rings that keep them in place. Ours have neither,
but continue to function.
4. The heat
switch shaft now rotates clockwise to tighten and counterclockwise to
loosen, the same as a normal screw, but opposite to the old heat switch.
springs (not pictured) go on either guide between the contacts in order
to keep the contacts separated when the switch is open. The springs
were acquired from Century Springs and have the following information:
Part No. S-1547; OD = 0.219 in; Free length = 0.31 in; K = 1.6 lbs/in;
Suggested max deflection = 0.24 in; Sugg Max Load = 0.39 lbs.