Looking at the pic, the spring loaded hold down on the shoe on the left looks to be at an angle,not straight. Make sure the shoe is sitting squarely against the backing plate. The shoe could be out over the flat "pads"it should sit on.There should be three of them for it to sit on,top middle and bottom. Also make sure that these pads aren't grooved from 40 plus years of old shoes rubbing slots into them. If they are they may be holding the new shoes out too far.