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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).
Instructions to modify a half set of rockers by adding a tappet screw and locknut, as per the provided sketch.

Identifier  ExFiles\Box 33\2\  Scan014
Date  10th January 1916
  
R.R. 309 (12 m) SA. 607. 19-5-15) E.P. 8514.
ROLLS-ROYCE LIMITED.
INSTRUCTIONS.
42050
X 1913
To OO.
Order No.
Customer's No.
In addition to the half set of Rocker instructed on 19th Nov last book on X1913. Please instruct an additional half set modified as per sketch below and fitted with tappet screw and locknut as shown.
Drill .337+3
Tap .375 DIA 34 TPI RH{R. Hollingworth}
lug removed and radius of boss continued round.
All other dimensions as per rocker. F 7148 B
CONTINUED NEXT SHEET
Signed RMB
This Sheet must be filed on completion of the work.
  
  


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