Valve-spring compressor tool features multi-point adjustability An updated tool from Schley Products, the Universal OHC Valve Spring Compressor No. 91400A works whether the cylinder head is on the engine or not, and features multi-point adjustability for proper alignment of depressing tube with valve stem. Positive attachment of depressor handle to pivot bar is through a connecting slider, and maintains adjustment angle settings. Includes additional 3/8" square drive for breaker bar or ratchet attachment.