Yours is not the original Redditch design, right, so don't worry about the design change.
As for oversize spindles, don't go in for that, they result in stress on the cam gears, as they tend to become heavier than what's required. As about adding bushes, it's almost like you are making a normal spindle work like an adjustable one. The only difference is that the adjustable ones come with a bolt that can be used to adjust the positioning of the cam gears & here you are using the bushes.
Take care.
Happy thumping,
Prakhar


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.may be we need to grind some length off .




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