Re: JS100 Upgrades... is it worth it?
Back to the original problems, the "twang" on the open strings is likely caused by the nut being too low on the treble side. A shim could fix that and often the shims are cut in half so only one side of the nut gets shimmed. As to the stud hole problem, is the wood cracked or just ovaled? If the hole is taking on an oval shape, you can fill the hole and re-drill. Remove the insert and drill the hole oversized with a Forstner bit(these bits drill a flat-bottom hole) and glue in a piece of hardwood dowel. The re-drill and tap the insert back in(or drill out to 11mm and install a set of Edge inserts and studs). If you have the skills, the JS100 is a solid ax that can benefit from some upgrades for a lot less money than a JS1000(which is a nice ax but sells in the $800 price range). I have the skills and would upgrade to a used Edge bridge if it were mine but if you don't have those skills, I understand that paying to have it done would make it too much money.