Dr.Al
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- 2,215
- Location
- Gloucestershire, UK
A lot of mills with r8 collet spindles, don't have a pin to stop the collet spinning, mine included. Just push the collet hard into the spindle with your left hand and tighten the drawbar with your right hand.
I'll try it again (although I don't have a 20 mm collet, so it won't immediately help). When I tried it last time (which admittedly was a lot of years ago) I remember finding it very hard either to tighten or loosen the collet (I can't remember which), but it might be I just need to learn the technique.