just picked up this Epi Strat style guitar for very little because the action near the neck is high. The sight line down the surface of the neck hits well below the bridge. Tried truss adjustment but no help. I think I need to shim the neck to change the neck angle. Does this sound like the right solution? Any suggestions? How can I determine the right size/angle shim without buying a bunch of different ones and using trial and error? Any free shipping sources for reasonably priced shims? If I can get the action fixed, I plan to put in a set of GM 1/4 pounders.