I don’t know about tungston in carbon, but serious expermintors like O.L. Adcock are using it successfully to increase FOC and also strengthen the front of wood shafts. Some places now sell drilling jigs to make it easy. I want to try this but where do we find tungsten rod of the right diameter (just under 1/8″)? I’m pretty sure that months ago somebody posted here that they had access to lots of it, cheap. If that person is still around, can we please here from you again? Otherwise, does anyone know a source? Thanks, bb