R19 Turntables and lowering

Hello MT municipality come from the Vectra corner but have a Renault question it’s about a Renault 19 F 66 kw 1.7 l (1721 ccm) the vehicle was already lowered according to papers … but the front dampers were defective the vehicle was rebuilt again in series (because was cheaper) .. according to papers a shorter spring set was installed on the front axle and on the rear axle the torso rods were “modified” …. now the question arises to me … how do I change the front F edern swap is easy…. but I’ve never done anything about torsion rods … or I haven’t seen anything like this again 🙂 ( .. can post me a “short guide” .. PLEASE … and thank you