Fowler water pocket

[weidner]

That is a damned awkward place for a water pocket ; dangerously near to the drawpin . Probably put there to avoid a scarifier .
I would be inclined to put one in a sensible place , now that there is no scarifier . Where do most DN's have them ?

I can let you have a copy of the drawing of the standard article . David Ragsdale may already supply castings .