As an alternative to the table top clamp above use two strips of wood with holes drilled in each end, slip bolts through the holes and use two shims in each end.
SHIM CUTTING JIG
Make the jig out of 3/4" plywood, the length can be any convient size to accommodate scrap material on hand, to use it lodge material into angled notch, set fence on table saw to cut width of shim, this can be from sharp pointed to wider with blunt end. After each cut flip material over end for end to keep the material parallel.
