To begin, the spindle housing was not threaded. ...

To begin, the spindle housing was not threaded. Luckily I had tap and die set and was able to thread the housing myself. While using the mower for the 3rd time since installing, the spindle began vibrating. The blade spins freely without the belt which tells me the internals of the spindle is junk. Will be buying OE parts from now on

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