I need to remove and rebed several of the aluminum (Bomar) hatches on my boat. Can anyone give me suggestions for the best way to remove them without damaging them. I''m concerned that if I use too much force, they may be damaged. Efforts to force them up from below using a hammer and wooden block to cushion the blows were not successful. I also didn''t have much luck prying them up using a large screw driver.