My 403 was also converted to Dunlop discs by the factory in 1958. It has the cap I pictured so I imagine they used what they could get hold of.
I had endless issues with the Dunlop callipers sticking and finally changed to Coopercraft. It was a huge improvement.
I will be interested to hear how you get on. 1:1.9 seems a little low to me.
I'm struggling to find a ratio for the original 406 servo 4257-551.
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