source for bearing please. several bearing houses have no such animal...looked in the grainger catalog and all bearings listed in millimeters? original post:Likestomow Senior Member Registered: Feb 2000 Location: Chattanooga, TN Posts: 501 A blade balancer is a device that utilizes ball bearings to allow the blade to turn easily and show which side is more heavily weighted. For the past four years I have been using two 5/8" bearings, from a bearing house, with a 1/4" center hole. I have them mounted on a 1/4" lag bolt with a nylon spacer behind them. The spacer allows the bearings to protrude out from the edge of a shelf. I then just slide each blade on the two bearings to check the balance. The cost is less than $3. This is an idea I got from Eric Elm and it has been a WONDERFUL tool for me.