I just sent a set of 1.6 Sharps back to summit this week because they would not clear my springs. They would have required some grinding to fit, which would have voided the warranty...so I sent them back (I hate to grind on new parts). This was on Eddy heads. The thing that bothers me is on the summit site it says they will clear 1.56" springs, and mine are only 1.539".....grrrrr. Oh well, on a positive note the sweep was right on (if they had fit properly).