Our custom light action spring to fit the Oscar Schmidt 21 chord assembly or any instrument which uses a similar \"comb\" type spring retention. That would include many luthier built instruments. Dimensions are 1/2 high with a generous 1/8 throat size. Stiffness is about 25% less than standard factory springs. Height is 1/8 less.
Oscar Schmidt item BRIDGE PINS. This is the part that sits in front of the tuning pin and retains the height of a string and ends the vibrating length. Item head style may not be an exact replacement but can be set to a height that will function properly.