hello out there i have a ques. i'm rebuild my pump (dominator 12s) do to cracked impeller. on the suction piece going through the bottom of the boat (where the bolt's go through)it has some type of hard puddy stuff. can't get to the bolt head's to pull the suction piece out! any body know what this stuff is and how to clean it out of there with out herting the boat or suction assembling? thank's Ty