Hi there. I can't find a thread that covers the specifics of this operation, but feel free to point me to one if it exists... I love the Hipshot replacement bridge for Rickenbacker (aluminum), except I can't get the beefy E string saddle to go any lower. I switched to Labella Flats with a thick E string. I can get the other strings perfectly low, but my E saddle is bottomed out and is still too high. Relief is good (almost straight), and my nut has already been dressed by a tech. I guess I need to file that saddle! What are the specific tools/files needed for the job and the proper procedure in how to do this correctly? Thanks!