Yes, when the microfilms are read in the diaries there are various spellings that link the Waterbridge to the nearby place Dunstall Hll and those spellings of the place vary, and the writing can have more than one interpretation in Green's hand writing.
I copied one case as "Turnstaff" and others of Turnstall, but the fact remains that the house was called Dunstall and that was where the racecourse was before it was moved to the present location.
John Langford was concerned enough to make the case for Dunstall instead of Tunstall and why a connection should be made with Tunstall. near Stoke, should be made is not the best comparison. James Brindleys, Trent & Mersey Canal was started near Tunstall and that place was, and is, on that canal navigation, and making an association with a water-powered flint mill is equally obscure.
That Dunstall was also called Tunstall on an Ordnance Survey map is more relevant, but those that conducted that survey were they influenced by the dialect?