Review on Zone Tech 4 5 Stepless Speed by John Murphy

It's nice to have speed control and it works great, but the fan hinge is plastic and seemed to stick after sun exposure, even with the compression ring off. I bought 2 for our RV and they both did the same thing. It would be wrong to do it by force. Be careful not to break the stem - it was removed from the windshield and lubricated to loosen it. Yes, they're cheap, but I suggest putting silicone grease on the ball swivel before using it!