here's a little tip i scanned from an old Heathkit Kit Builder's Journal a while ago; while it deals w/ poor sensitivity from the getgo, maybe it will help those w/ the problem now being discussed. http://home.att.net/~btuttleman1/GC1000tip.jpg i'm going thru some other scans from this and other mags to see if there might be something else to assist. tnx, barry carson city, nv