GrahamGKD
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In Eclipse terminology, the 123 is a pin vice rather than a pin chuck.
It looks like collets for the 160 are available, but not the 123.
https://www.spear-and-jackson.com/p...tools/chucks-and-collets/pin-chuck-65mm-2-916
https://www.spear-and-jackson.com/p...nal-tools/engineers-tools/pin-vices/pin-vices
But drop a line to Spear & Jackson and ask them.