Abstract: In combination with a C-clamp type valve spring compressor, an adapter, comprising a circular proximal plate having a top surface and a concentric proximal hole; multiple vertical support members having proximal and distal ends, the proximal ends are integrally attached to the top surface of the proximal plate and equally spaced circumferentially around the proximal hole; a distal plate equal in diameter to the proximal plate further having a concentric distal hole equal in diameter to the proximal hole; the distal ends of the vertical support members are integrally attached to the bottom surface of the distal plate; wherein the adaptor is symmetrical about both an x-y plane and a y-z plane such that either the distal plate or the proximal plate may contact the valve spring, and wherein the support members define three areas of equal width for variable access points to the spring keeper of the valve spring.