I have been messing with an older Pedula Bolt on neck Series II for over a month with setup including traditional saddle and truss rod adjustments and more significant shimming of the neck getting an unplayable bass fairly close to playable with low action. But I am convinced now that the last bit of adjustment I need to do is lower the slots in the nut. I do not want to spend $70 Warmoth wants for a set of nut files. At the same time a pocket knife is not working too well. Any $10-$15 suggestions?