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single slider crank is a simple actuator which consists of four links and which converts rotary motion into reciprocating and vice versa.
The theory of the Slider-crank mechanism is while the entire mechanism has six free degrees, the whole system only has one free degree. When those six degrees start moving, the whole thing can only move in circular motions.
There is a hardware protection on the card itself. It's a little slider on the side. One way is protected, the other is not. Typically, having the slider up, towards the contact side of the card, is unprotected.
Used for Oil Pumps and stuff.
I suppose it depends on what you are repairing, I just replaced this exact transformer in a vintage Mr. Christmas Carousel Calliope. It is a 6v center tap transformer, I replaced mine with the one below which can be found on Amazon and is a 1amp. My carousel works good as new. I hope this helps someone. Center-Tapped-Transformer-117VAC-12VAC/dp/B00SOY36M8