[Rockhounds] HP 10" saw

[June Young]

I recently acquired a 10" Highland Park saw.  At the best guess, I would say the oil in it had never been changed.  It smelled awful and in order to clean it I needed to chip out the bottom with a screwdriver.  Now that it is all clean and I am ready to use it, I was wondering what the motor on the front was used for?  It turns a rod with threads on it.   It also came with a rod, weight of a heavy wire, with a 90 degree angle on one end.  Can someome tell me what that is used for and where it goes? 
Thanks for your help.
June


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