I have a Reid 618 rollerway that a mouse got into the vertical worm screw in the column and made a mess after I purchased it and I didn't know till after I moved the machine 5 months later. Worked fine when purchased, then it was frozen with rust from mouse pee. So I bought another grinder and swapped the column. One day this winter I hope to shim it to square in all three directions to the spindle and get the machine back together. In my mind I think I can figure it out but it would be nice to have a "procedure" to follow or watch a video before I dive in!