Hello all, returned to cycling after a 15 year abscence (!) last summer. Am still using my Ribble 653 frame and have upgraded as I go. I want to replace the headset/ stem, but mine is an old fashioned conventional alloy 'L' shaped stem. I want to upgrade to a modern one, but don't know if this is possible with my frame/ forks. I know this may be a divvy question, but can someone explain all to me please!!