gotta pull the burner and plate, studs will break... I torch them red hot, then gently wrench as it cools if they are rusted. use lots of antiseize on assembly. Will need gaskets, chamber, available from Lynn products. Miller's usually die from being oover fired or not having ductwork attached to the base... gotta have some static pressure around the heat exchanger. scrap it if it's cracked BE SAFE.... CALL A MAINE LICENSED OIL OR GAS SERVICE TECH.... we needthe work to pay the statefor the privilege of working:-) but really, on the coast they get eaten by the salt so be careful.