Comments On Nov 13, 2015:Having an extra pen twist mechanism is a good thing to have on-hand...just in-case you happen to drop the one that came with the pen kit...and you are unable to find where it went under your workbench. (Of course...I am not speaking from personal experience...I wish...) But if such a thing were to happen to you, I can say from experience that it would have been nice to have previously had a backup on-hand. Since it isn't an expensive component, I would highly recommend you get one. I know that the price of this component was a lot less than the time I spent trying to find the one I dropped.
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