I use 1/2" X 3" or 3 1/2" fine thread bolts with heavy fender washers. I set the bolt up on it's end and place 4 washers on then 4 or 6 tips evenly spaced around the washer , then add 1 washer and more tips and so on until I get 4 layers. I cap those with 4 washers, the nut and torque it to...