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Manual Tremolo - Homemade Device

James Whiting posted a real pretty piece where he manually rotated the fan blades. Dr. Bob commented that he would like a crank on the side to override the motor and have the blades pop back to the open position. That made me wonder what I could make from things around the house to do that. Here is the result. I used a 7.5" Jumbo Rubber Band, Spring-type door stopper, shim, and a quick clamp. I screwed the door stopper into the shim and clamped it to the vibes. I replaced the original belt with the rubber band, gave it a twist so it would stay around the door stop.

G7 C# Diminished G7 C# Diminished G7

I always like that progression and I'm not a theory guy, but I have my version on why it works and what it's about. I was actually going to make podcast about it, but I thought instead I'd open it up for discussion first.

What do you think about that progression? Why is it you can slip in a C#dim in between a repeating dominant chord??

I'll leave it at that.