The design is simple, but this design is executed better than others. A nearly identical tool, TEMCo part number B00E1UUVT0, has a much looser tolerance. (The TEMCo tool needed a brace around the stem to keep it centered.) It also has a 7mm round punch and this one has a 9mm square punch, so this one is either better for small protrusions or this one is less likely to come loose. uncrimped wire next to the punch.
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