HJ looks at the PDF file page numbers, and everybody else is looking at the catalog page numbers.
So yes, there is a drawing on PDF page 10, and it is a screw grip.
Screw grips do have a rib extension. (it is on the drawing if you what it looks like).
Those Evans sidelocks definitely have screw grips. One of the clues is the Horseshoe around the toplever.
Best regards,
WC