Just finished a parts Thinline. Dropped new neck in and added strings and found the strings are bottomed out using existing Squeir bridge as high as it can go. I have shimmed the hardtail bridge temporarily (1/6-1/8) and that works fine but I need to come up with a better shim or solution. Any suggestions? Right now the guitar plays good except one area. Stretching 3rd and 4th string a full step up on 10th fret bottoms out and buzzes. All other strings and frets areas are good. Is this a high fret issue.