You can do it if you are not too big to get into the fire
door. You should provide yourself with a flue expander and a calking
tool, with a machinist's hammer, (not too heavy). Take into the firebox
with you a piece of clean waste with which you will wipe off the ends of
the flues and flue sheet to remove any soot or ashes that may have
collected around them. After this is done you will force the expander
into the flues driving it well up, in order to bring the shoulder of
expander up snug against the head of the flue. Then drive the tapering
pin into the expander. By driving the pin in too far you may spread the
flue sufficient to crack it or you are more liable, by expanding too
hard, to spread the hole in flue sheet and thereby loosen other flues.
You must be careful about this. When you think you have expanded
sufficient, hit the pin a side blow in order to loosen it, and turn the
expander about one-quarter of a turn, and drive it up as before; loosen
up and continue to turn as before until you have made the entire circle
of flues. Then remove the expander, and you are ready for your header
or calking tool.
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