what is "natural" rocker?

so, what is it?

so, what is it? It’s a blank that a shaper gets fron the factory without any changes to the rocker’s shape - it’s the “natural” bottom shape that the designer of a blank planned.

Natural rocker is the exact rocker shaped into the plug for the mold by the designer of the plug. This is the rocker shown in the blank picture. (Clark Foam catalog pg.4)