What is the best tool to use to DIY change front ride ht?(what size on 70T?).......how many turns(approx) are needed to move say 1/2 " up or down?; if bolt is ez to get to, is it ok to do when car is on ground?....any caveat's to this if only 1/2" change is desired?....I realize an align. or corner balance should be considered.......TIA: