Got humpty dumpty back together and will do a road test next week. There certainly does not appear to be a brake flange. Had a closer look after scraping off some crud and found that the brake assembly is welded to the
axle. According to the Dexter site, about one half of trailers come this way from the factory. My axle was made by Aurora. So as I see it, my options after the road test include: 1) if the brake test goes well, just leave everything as is 2) replace shoes, magnet and associated hardware. 3) order a new axle. Any suggestions are greatly appreciated.