I replaced yesterday my tub valve stems with a sayco stem kit for bathtub (with knobs
& all) from home depot.

my original stems were also sayco and the hot & cold had a small leak so the kit
replaces all three (hot, middle diverter and cold)

question I had was about the small nut closest to the handle where I can tighten the
stem before I screw it in.
how tight should this be? currently with the new stems in, there is a small leak of
water from the cold side when I open only the hot side and am not sure if that is
due to the middle diverter stem or the cold stem needing the nut to be tighter

I did first handtighten it and then with a small wrench, turn it 3/4 of a turn as I
was afraid to overtighten it.