Hi - I am new to this website. I have an older Vermont Castings Resolute III. It does not have the fire bricks inside it. The 'liner' on the right side has started crumbling away at the slotted section. I have purchased a replacement part, but cannot get the old one out. We had to drill the screw head off, but still won't come out. Do I need to take other parts out first? Looks like I might need to take the left side and back out first?? Anyone know the answer?? Thanks!