Machining a Surface grinder wheel hub PART 4

In the 4th installment of machining a surface grinder wheel hub from scratch I make the Locking nut that holds the grinding wheel in place.
It's a pretty simple part, its a ring with a couple of holes and a M50x1,5mm left hand thread.
First time I turned a left hand internal thread on the lathe, went alright and the part came out pretty good.
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