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Spinindexer is not much use in a lathe though.
The advantage is that you can pass bar through the chuck.
You don't need to use the quick lever closer on these, you can use the supplied locking rings instead so you can mount them vertically in your mill vice if you need to.
When using the locking ring and with the block held say vertically in a vice is it possible to undo the 5C collet without removing the block?