Utility knife with spare blade compartment.
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Previously:
https://www.homemadetools.net/forum/...194#post191842
https://www.homemadetools.net/forum/...470#post185588
https://www.homemadetools.net/forum/...353#post185200
https://www.homemadetools.net/forum/...325#post185137
https://www.homemadetools.net/forum/...156#post176519