I am a beginner woodturner. I've never tried twisting a pen without the mandrel lock, so I have nothing to compare it to. All I know is that I haven't had any issues with the mandrel bending, so I'm assuming it's working as it should. Because it works, I won't use the mandrel without it, and I risk bending it and rendering it unusable. I'd rather spend some money up front than change a more expensive part more often.
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