A method of forming a coupling between a first part and a second part is disclosed. The method includes providing a first surface of the first part. The first surface has a first shape and a surface roughness average that is less than or equal to about 500 microinches (13 microns). The method also includes forming a second surface of the second part where the second surface has a second shape and the first shape and the second shape are substantially complementary shapes. Projections form at least a portion of the second surface in a preselected pattern, and are configured to produce a friction fit between the first surface and the second surface when the first surface and the second surface are biased against each other. The projections have an average elastic compressive range substantially equal to the surface roughness average.