Tack Bending

lasting technique of hammering already set lasting tacks to bend them

Makers may bend tacks through lasted uppers toward the midline of the last. Some also block insoles by driving tacks near the featherline and bending them outward.

Bending tacks through uppers serves a few purposes:

However, bent tacks have to be straightened before using again. More often, perhaps, bent tacks are simply discarded.