I'm only giving 3 stars because both ends of the rods have right hand threads so no Z axis adjustment is required as they can. The metal seems strong enough to be drilled and tapped to get a larger left-hand threaded end. For what I bought them for, they fit perfectly. I've had ringing issues on larger prints sometimes causing the print to fail, but no more. I still have a small problem with the bell, but that's because it's not a CoreXY printer and it's not because of the cores.
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