My Old Landy
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The run out I had on my ER20 set was 0.06mm after a bit of fettling. Surprisingly good I found. I did a thread on it I will try and find it.Just how bad is a set of collets like this liable to be?
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edit: https://www.mig-welding.co.uk/forum/threads/er20-collets-not-quite-right.102763/