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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
The material choice for the pivot pin on the 20/25 HP chassis make & break levers.

Identifier  ExFiles\Box 61b\1\  scan0166
Date  30th May 1933
  
Hs{Lord Ernest Hives - Chair}/Wst. 86118 BY/4/G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 30.5.33.

20/25 HP. CHASSIS - MAKE & BREAK LEVERS.
WST

Referring to Hs{Lord Ernest Hives - Chair}/Wst.3/MA.23.5.33. I did make the suggestion you referred to of using a brass bush instead of phosphor bronze for the pivot pin to work upon, but had overlooked the fact that in order to get the brass sufficiently hard to represent a reasonable rubbing surface it would be too hard to spin over ascalled for by the design.

BY.{R.W. Bailey - Chief Engineer}
  
  


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