We've had a couple reported on Outdoorking Deejay, this was the most recent:
https://www.outdoorking-forum.com.au/forum/u...ords=aluminium&Search=true#Post47397

Just from what I've seen in threads, the stamped steel gears only appeared after the aluminium ones became unavailable. The aluminium ones had cut, involute-form teeth, not the simple triangular cogs/pegs the steel gears use. They should have been a great deal gentler on the mating pinion.