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A fair bit of America must now be owned by China :)

Or putting an O ring under the nut and mildly tightening on to it.

Yes, I believe it works very well but it shags with neck tension in achieving straightness. Consistant repeatable neck tension is one of the biggies for accuracy.

Again, depending upon your end...

Ha ha you don't see any improvements from using one. It just identifies the issue. You have to go back thru your process and find where the out of concentricity is being caused. Something that may...