Peter Neill
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Here's a handy little accessory for turning or facing thin parts on the lathe.
It's an adjustable chuck spider that fits over the jaws, and has a threaded spinner to space it the correct distance away from the chuck face. The idea of a spider is not new, but I've never seen one with a threaded adjuster.
The plug at the back end is a close fit - half a thou' undersize - on the bore of the chuck, and sits behind the jaws when they close, with the spider supported by a smaller diameter shaft. The spider is held on the threaded shaft by a countersunk cap screw loctited in place.
The second picture shows it in use gripping a washer that was originally 0.074" thick after it had 0.020" faced off it.
Peter