Help advice,on adjusting torsion bar

Hi all.Well on my ford spectron van same as the mazda e2200 the driverside front is 1inc low than the passenger side.I have put the van on level ground tyres pressure correct.I then adjusted the nut.But its still the same hight.The adjusting nut is very tight so i dare not try anymore incase it snaps.So i have took it to a garage who says all he can do is drop the ball joint off re adjust the nut and see if its any better no guarentee it will work.So is the anythink else that could be check.Please help.