I have a '93 Tracker Pro17 and both the pumps are needing replaced. The bilge pump bottom cap (blue Rule) is riveted to a piece of aluminum that is riveted to the transom. How in the heck do you replace that? Drill out the rivets and put screws in place of the rivets? Kinda of a tight space to do that, was curious if anyone else has come across this. I really don't want to disturb the transom rivet if possible.