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On a sample of one, the welding on mine (MTB) 'looks' immaculate and is never going to crack!
Like most things Raleigh I think they achieved a fair balance between cost and performance when you escape the gas pipe / fashion bikes.
It appears they worked with a few accomplished companies...
Not sure that looks like a carefully placed, suitably sized, reinforced and carefully finished hole to reduce stress concentration - possibly more like it was too hard to get the torch and rod in?
I'd ride it if it was mine but I wouldn't be surprised when it broke again.
Vinegar works but quite slowly. I quite like using citric acid - cheap enough if buying a reasonable quantity.
Be nice to keep as much chrome as possible but depends how you want to use/store it. A wipe with an oily rag every couple of months does wonders!
It was all a happy accident when during the wheel build stud lock was accidently used instead of lubricant on the spoke threads. The only way to tension up the wheels was to twist the spokes. Et voilà, Bob's yer uncle!