The keyway on my harmonic balancer is slightly "buggered up" - if you've read the tech article in the recent Toyota Trails then you know what I'm talking about. Question - rather than trying to weld (followed by a bunch of filing) to repair the current keyway - would it be acceptable to have a machine shop cut a new keyway 180 degrees (directly opposite) from the current one?  oes anyone see a problem with this? Should the old keyway be filled in with JB Weld or other "metal" filler? A buddy of mine suggested cutting the existing keyway a bit larger to clean up the edges and use a step-key(?). Sounds like a possibility - anyone done either of these? Mine is the three pulley balancer - as you know these not cheap to replace if you can find a "good" used one so I'd really like to try an inexpensive fix IF it will work. Thanks in advance for advice.