John, I seem to recall an article about this in the MAFCA restorer magazine probably 6 months back. Someone rebuilt his and did some documentation on it. Over the winter I am likely going to be cannibalizing a couple of less than optimal powerhouses to fix up the one in my 1929 which is ready for a restoration. I am by no means an expert, but figure it is worth trying to do myself and have taken apart a couple over the last 10 years. If you need/want, shoot me an email.
Seth