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The knuckle is the same between a 350/4 and a 400/4 but the kickstart shaft itself is shorter on the 350.
As these seem like gold dust why have the likes of David Silver not done a pattern equivalent? Complication / cost??Tim
I seem to recall this topic came up on here not too long ago, the answer being that DS did look in to getting copies made (possibly in China, I can't remember) but there were quality/strength issues with the knuckle so the project was abandoned.