I have 21 tortoises (torti?) working for 22 years with never a failure. When adjusted correctly they provide excellent springiness to move the point blades firmly to either side. As mentioned above, they work well with multicolor LED lights to show positioning. The built-in DPDT relay can be used for block control either through an external solid-state or high-amperage electromechanical relay. The tortoise manufacturer recently announced they are using a new motor supplier. That will obviously be an important factor in long-term reliability. Time will tell.
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