Canon XA9-1047 EF Screws
Genuine Canon shoulder screws for the EF 300 2.8 L IS USM and EF 400 4.0 DO IS USM lenses and other Canon imaging products. Package of 1 screw. Made by Canon Japan. This screw was made for this tripod collar guide roller.
Canon CY1-2833 Focus Ring
Canon YG2-2031 Power Diaphragm
Canon YG2-2062 Power Diaphragm
Genuine Canon power diaphragm assembly for the EF 24-70 2.8 L USM lenses. Made by Canon Japan. Unfortunately, this part has been discontinued and is no longer available.
TechNote. Many times the issue you may have with your lens points to the power diaphragm unit, when actually the FPC (flexible printed circuit) has broken and needs replacement. In stock here.