Just drilled out some rivets from under a 16ft aluminium fishing boat tiller type , i have 3/16 inch rivets for it but when the rivets were removed the hole size on all of them are exactly 13/64 and the 3/16 rivets are loose fitting. Drilled out a couple that werent leaking and the same hole size is slightly larger. Is this done on purpose from factory so rivet will expand more or did lund use a slightly larger rivet for bottom of hull? ( used a small drill bit to start then a 3/16 drill bit to take a bit off the head of rivet , then knocked the head off with a chisel )