Poverty knockers was the term used in West Yorkshire for women minding the looms ~ simply
Probably the cacophony of noise in weaving mills is best typified by two knocks
Tom Daniel insisted that "tap tap" be inserted
Tom's lyrics (in A.L.Lloyds Folksongs In England) and on www.yorkshirefolksong.net was in my view a compilation of verses some from the poverty knockers and some from Tom (made up)
I do know Mrs Fawthrop from Pudsey had had some involvement