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Lateral slits by H&W - why not thinner?


I have seen jotronics clip with his melon, making needle holes and lateral slits in it. Obviously the slits are less traumatic to his melon. But the used blades have around 0,058 inch (0,23 mm). There exist thinner blades. Why not using such thinner blades? Must be even lesser traumatic. Anybody knows?