My son and I are building a 32 and had the same problem. I bought new bolts and I do not even know how many washers. I finally cleaned everything then put a white paper towel under the caliper and began tightening. I tightened the bolts until each time I did it I would flinch because I just knew the bolt was going to snap. I would check the towel the next day and see if they leaked. I did this for some time until they finally stopped.