Oversized part hold down apparatus

A method of retaining a part being processed, the method comprising:

• positioning the part upon a rotatable support, the rotatable support extending along a central force axis;
• aligning a part hold-down assembly above the part along the central force axis, the part hold-down assembly including:
• a top plate extending substantially perpendicular to the central force axis;
• a bottom plate extending substantially perpendicular to the central force axis;
• and
• a compression assembly retained between the top plate and bottom plate, the compression assembly comprising a first compression biasing member and a second compression biasing member, wherein the first compression biasing member is positioned along a first compression axis that is parallel to but offset from the central force axis, the second compression biasing member is positioned along a second compression axis that is parallel to but offset from the central force axis, and the first compression axis and the second compression axis are positioned generally opposite from each other along the central force axis;
• and
• moving the part hold-down assembly such that a compression force is applied to the part, the compression force first traveling from the central force axis to the first and second compression axes through the top plate, and the compression force then traveling from the first and second compression axes back to the central force axis through the bottom plate.