MUST READ TIPS
NEVER tighten an empty collet.
NEVER turn the spindle on with a loose collet.
Therefore before turning the spindle on either insert a tool and tighten the collet nut, or remove the collet nut and collet.
NEVER put a tool with a shank bigger or smaller than the collet's clamping range
Metric collets have a 1mm clamping range
if there is only 1 number on the collet this is the max shank diameter, the minimum shank diameter would be 1mm smaller.
ALWAYS insert the ER collet into the collet nut first and make sure it clicks in
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