Use a a Carbide Bur (upgraded tool: Pink Zirconia Coarse Bur) to fit the model. Fit it gradually to ensure accurate retention.
When finishing the clasp, grind from the top (not the inside or the outside) to avoid gaps that cause food traps.
When finishing the clasp, taper the clasp into a point in the interproximal areas. Grind the clasp to get enough tooth structure and some tissue area to retain itself.

Use high speed when finishing Unbreakable™ and low speed with iFlex™.