Keyway for an old cast iron Ryobi wood lathe keeps bending out of shape.(pictured)Toolrest wont slide freely.Tried removing it and squeezing it flat with a bench vice then applying some paste wax and it worked well for a while,then it bent even worse.The only thing I can think of is that from the headstock to the tailstock there is not enough support so the keyway begins to bend.
Any solutions other than replacement? Lathe pictured below
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