New packing compresses a little during initial use, so if he has the "feel" he may have it just right. On the flip side, my packing dosen't leak more than a drop an hour. It's been like that for 3 years. I've taken the nut off to look at the shaft and there's no evidence of heat or scoring just a nice smooth shiny shaft. If the packing is overtightened it'll start showing some heat right at the end of the packing on the inside of the nut usually. If you want to be safe, loosen it off 1/8" turn or so. You will probably have to readjust after a few hours.