Yes try Nancy Zieman's website. Just last week on our local PBS station she showed how to do this by cutting the old zipper close to the stitching line, fraying out any left over zipper tape and then using basting tape to secure the zipper in place while you sew it. She used a ribbon on the back side to make it look better. Stitch along the previous stitching line with matching thread and you can't even see it.She said use a zipper shorter than the opening as it is very hard to turn down the excess with the metal attached. Also showed how to insert a new zipper into a pair of front zip trousers or slacks. Very clever.