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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).
Modification sheet for Bentley Stabilising Bumper Bars, replacing a plain nut with a castellated one.

Identifier  ExFiles\Box 118\2\  scan0200
Date  20th March 1935
  
To Hd.{Mr Hayward/Mr Huddy} (FOR DEPOT SHEET)
4522
HS{Lord Ernest Hives - Chair}/FJH.{Fred J. Hardy - Chief Dev. Engineer}16/KW.20.3.35.

Bentley Stabilising Bumper Bars.

A case has occurred of the Ø.375 nut which secures the Bob weights and the chromium plated bar to the two spring leaves working loose.

This nut is at present a plain one with spring washer, and should be replaced by a castellated nut, split-pinned as on the attached HS.{Lord Ernest Hives - Chair}1845.

Will you please carry out this modification to all Bumper Bars as they are fitted to chassis, and also on Bumpers already supplied to customers as the cars become available.

HS{Lord Ernest Hives - Chair}/F.J.Hardy.
  
  


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