the cleaning tool inserted into the heater up to the handle.
https://files.mastodon.social/media_attachments/files/114/894/939/362/337/925/original/31c5548bb9bfa914.png
so um I've owned this Hakko FR-301 desoldering gun for years now and I just discovered that the blue handled "screwdriver" is actually meant to clean out the heater. 😳
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