With the extension everything needs to be perfectly balanced for it to work. I don't know if the Amana Tool extension was unbalanced or if my router wasn't perfect. The extension amplified all the little bugs in my router, bit and the extension itself. It was making a lot of steep noise and rough cuts as the shaft failed more and more. Maybe a 1/2" shaft extension will do on a quality router, but I won't try any other 1/4" shaft extension.
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