John, thanks for posting the photos of the G315! It certainly looks HEAVY.
One quick note on the Gyromatics vs the bolt down tumble action machines. BOTH the Gyromatic and bolt down washers used the same tub back, besides the Gyromatic heater models. The only minor difference between the later bolt down wash tubs and the Gyromatic is the size of the opening on the front end. Otherwise, they are the same diameter and length, and both are rated at a 9 pound capacity. And yes, the later bolt down machines spin at 412 RPM (vs. the original 333 RPM up through '48), and the Gyromatics spin at 525 RPM.
I've often wondered if Bendix had already tied up the patents for a shock assisted suspension by the time Westinghouse introduced their pre-War washer in 1940. Either that, or Westinghouse already had such an expensive machine that their leaf style suspension was a cost savings over using a hydraulic shock.
Ben