It has been quite a bit of work, but the winding of the solenoid coils and the construction of the armatures is finished.
Some notes on the armatures, they are made from 6mm steel rod about 17mm long. To the end of each steel slug a 2mm x 6mm round neodymium magnet is attached. Super glued to the top of each magnet is a piece of 1mm styrene made using a hole punch. The purpose of the styrene is to produce a more pleasant tone when the armature hits the aluminum bar. I may end up gluing a piece of felt or similar to the bottom of each armature to dampen the clicking noise produced when the it drops back into the coil after being actuated.
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