When filing the rear sight notch, I start w/ a triangular file to center and the "V" is slightly wider than the needle file's rectangular small side width. After the square notch is filed to depth, the notch is widened w/ a rectangular needle file w/ a smooth small side. Usually I make the notch width twice the width of the front blade as seen while sighting, for hunting....easy "pickup", especially in poor light. After the notch size is achieved, the sides of the notch are angled so as to make the notch wider towards the muzzle side of the sight. This filing is all done at the range w/ the rear sight in place and cardboard is taped to the bbl so the file doesn't mar the bbl finish. Judging from your experience, you'll have your new, beautiful LR shooting w/ accuracy befitting a "squirrel rifle". Asre the triggers...hope you can rectify the 9lb pull on the unset front trigger. I used this same trigger on a Stith Hawken and the unset pull of the front trigger was 4 lbs. Good luck....Fred