I always wanted one of the 6 1/2 worm drives so I was pumped when I found one at a local pawn for $35. After realizing it rattled bad cause some goober didn't knock out the arbor diamond I bought it brought it home disassembled cleaned replaced the chord and painted a few odd parts with epoxy black. So here's the issue. It was full of grease not oil,so I kerosened it out replaced with skil lube.it has a new diablo blade . I noticed the blade seemed to wobble and there is a rattle sound it goes away if I pull the blade. There is no play at all in the shaft. There is enough slack in the gears that the tip of the blade has 1/4" before it turns the motor its self. I looked in at the new oil and it's got brass in it . Dust but no flakes. Any ideas . Is the rattle the worm drive? Is the shaft bent? Help guys.