The Spashett I got had what looked like rust on the armature and looked the same as yours Paul. Although mine works fine (I ran it in the 4wd at Oswestry), so I wouldnt worry too much about the corrosion.
After borrowing a 10x2 Checkpoint from Mr Latham at Batley on Wednesday I can safely say I'll be replacing my Steenari V2's with Checkpoints as they wear out. Not quite as much torque low down as the V2, similar mid-range and OMG it explodes in the higher rev's

I was having trouble keeping the front end on the ground at the end of the straight at the end of the race!
How fast was my B4 Carl even with those old cells?!