Yes the Manual rudder versions do have mass balance weights - they are bolted directly onto the leading edge of the rudder,they are wedge shaped (tapered) to give adequate clearance with internal Fin structure.
Cannot remember any exact figures for checking the balance but they hang very nose low on the check rig.
I would think that the later marks with powered rudder would also have balance weights as they have manual reversion to cater for hyd failure.
On the Hawk tailplane circuit there is a non linear gearbox mounted in the rear fuselage forward of the Tailplane PCU (power control unit) to give adequate tailplane range of movement,this NLG gives Fine control movements around T/P neutral but gradually gives coarser movements (IE increased angle change for given stick movement) as the tailplane angle increases.
Edit...just re read your posts...
the T/P (stab) is not mass balanced and its c of g is behind the pivot points,it will naturally and gradually 'droop' trailing edge down when hyd pressure dissipates.
Last edited by longer ron; 28th February 2013 at 19:50.