Having learned the hard way, this is a Cautionary Tale.
When you purchase a new faceplate or chuck for your lathe it is always worth checking to see if there is any swarf left over in the thread after the machining process and also check that the new thread is correctly formed.
It is possible to do a lot of damage to the lathe thread if the faceplate or chuck is forced onto the machine with these defects.
Make sure to inspect the thread and prepare it accordingly. If the accessory does not screw on freely by hand, never force it with a lever.
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