i see.indeed it may not be very sophisticated of a repair but it's a critical one,that calls for some expertise to deal with it.
ill try for a start to see what its going wrong,following the paradigms above and then decide.

if i put another one, ie. carbon,will worth it?
i rode a friends alu-carbon bike (frame-fork) and seemed very light front-end.was it of the lightness or the different leverage of the system (44cm bars instead 40 on mine)