|A Sinking Feeling|
Even more closely:
|Another Sinking Feeling|
|And Yet Another|
Whether it would be possible for the top plate to be flattened simply by screwing both chimney bases down tightly, I did not want to entertain in case a casting cracked in the process.
I then checked the effect of loosening the superheater support (where the two nuts are). Indeed the sinking could be lessened to 1/8" instead of a 1/4" which I felt would be satisfactory.
It's clear that it will be better to slacken the superheater support and tighten down the chimney castings first to make the top plate flat. Then tighten the superheater with the chimneys in place.
Nice idea but see the picture below:
|Space between the old chimney bases|
But where there's a will...