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Advice gratefully received, The chuck key issue I have already learned the hard way, it is surprising how far it goes on a quarter turn start up, fortunately without hitting me or anything valuable in the garage.
I plan to turn 25mm bar down to 22mm for both plugs first so approximately 50 mm then reduce to 18mm for the middle 42mm then drill right through 5mm (to later tap a 6mm thread) then part off in the middle. Then part off the chuck jaw end. I will obviously have to allow for the thickness of the parting off tool in the total length reduced to 18mm. So would the use of a fixed centre be advisable with this method?
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