Herepath
A glassblower, presumably in Lancre, who has a certain embarrassing personal difficulty which is resolved by one of Granny Weatherwax's special herbal preparations, and which enables him to start blowing glass straight and true again, in a manner of speaking, of course. Of course, had he (or rather his wife) gone to see Nanny Ogg, she'd have prescribed them a recipe for Special Chocolate Sauce or something similar...