That knob is such a bad design! I have modified my hood to use springs :Well, I just put it in my cart. (Didn't complete checkout, but it felt kinda good to hit the button...)
Actually, if I factor in the $44 Nikon charged for me a replacement hood knob on the old 400 2.8, I'd be stupid not to save myself the trouble and just buy a new 400!
I'm lucky, I just go to Nikon repair at El Segundo and ask for the parts directly. For little things like knobs and screws, they just give them to me. I install the parts on the spot and they don't charge me for labor or the parts! It's good to be known by name at the Nikon Repair facility!That knob is such a bad design! I have modified my hood to use springs :
I'm interested in seeing some other views of your modification. My 400 2.8 will be 10 yrs old this coming december and have replaced the lens shade knob assembly once already(PITA bad design IMO). Bought the parts from Nikon and had it repaired locally for $5.