Ballpoint pen refill Spring receiver adapter
thingiverse
直径3mmのボールペンの替芯に、スプリング受けの突起を追加するためのものです。 手持ちのuni jetstreamの替芯にはスプリング受けがありませんでしたが、このリングをはめることによって、スプリング受けが必要なペンでもこの替芯が使えるようになりました。 --- This is for adding a spring retainer protrusion to a 3mm diameter ballpoint pen refill. The uni jetstream refills that I have do not have a spring catch, but by adding this ring, I can now use this refill with pens that require a spring catch.
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