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The large Allen bolt is used for to split the burner (main part from part that also has blast tube and flange on it.
Removing the entire burner is fine if you make sure the seal at flange to boiler is still okay and the bolts are holding burner in firm.
No need to over tighten
Removing the entire burner is fine if you make sure the seal at flange to boiler is still okay and the bolts are holding burner in firm.
No need to over tighten