When I had a '54 the only tech info I was ever able to find was a 13 page bulletin (K-W 229 I have a very poor copy, so could be a 3 instead of 9.) This was dated April 2 1954, and was mainly a list of specs, altho there is some technical guidance. I would suggest getting this, as it may be all there is. Mayhap others have found something additional? Otherwise, the 51 and 52-3 are the baseline.