Comments On Apr 28, 2015:It's a good idea to keep spare tubes for mistakes.
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Comments On Nov 30, 2014:I like having a couple extra tubes on hand for all of the kits I use in case I make a mistake. Its also nice if I run out of kits to be able to go ahead and make another pen while I am waiting for the hardware to arrive.
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Comments On Oct 18, 2013:I almost always buy an extra set of tubes, when I turned the bushing the wrong way I needed one.
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