Testing the runout on a D1-4 fabricated ER40 Set-Tru (adjustable) chuck. Build is poster here:
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The Set-Tru back plate is a Gator FLA-125D4, and the Gator adjustment screws FS-P-125, the chuck body was turned from 5" round stock of 8620 alloy steel. The ER40 nut is a bearing nut which greatly improves the accuracy.
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