I think it was Howard Chappelle, a maritime historian, who first described in print the use of the Moaning Chair, in the context of boatbuilding. Until I can find the exact quote, this recollection will have to do. The general theme of this advice applies comprehensively to homebuilt aviation:
"The boatbuilder is well advised to place a comfortable chair within easy walking distance, but out of sight of the project. When the builder has done some damn fool thing, like cut two left garboards, or put a drill bit through a newly varnished Honduras mahogany panel, they must immediately retire to the moaning chair, until the period of moaning is complete, lest they turn the whole project into firewood."