Here's a review on the Tsunago pencil sharpener, pencils extender, or pencil joiner, Haven't got a clue what to call it, but it certainly is an interesting little gadget to keep with your graphite drawing materials & art supplies.
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Amazon UK,
Tsunago sharpener, https://amzn.to/2Lpi9mo
Staedtler pencil holder, https://amzn.to/2o88wPZ
Derwent pencil holder, https://amzn.to/2oaI2NS

Amazon USA,
Tsunago sharpener, https://amzn.to/2MOIhw4
Staedtler pencil holder, https://amzn.to/2NhyefU
Derwent pencil holder, https://amzn.to/2oa4lDn

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Jacksons art supplies, https://www.jacksonsart.com/?acc=eda8...