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Although the 31-spline Bulldog axles are gun drilled, one end on each has a slug pressed into place. These allow you to install bolts on each end to use as spacers. Notice the nut that is also threaded onto the bolt before installing it onto the axle. This will be used as a lock-nut to keep things from moving once we’ve got the proper spacing for the axles. We haven’t done it here yet, but you may also want to grind the end of the head of the bolts smooth.