Nikon built-in lens hoods - any way to tighten?

I've got a 105 2.5 and now a 300 4.5 EDIF, both of which are great.

The aggravation is in the floppy built-in lens hoods. Some samples

are nice and tight, snap into and stay in place. Mine extend just by

turning them down or taking them out of the bag, and then are loose

as a goose, too easy to slide them back and forth. Anyone know if

these can be tightened up, either by a service center or home-made?

Thanks!

Kirk,

You can probably get an authorized Nikon service center to tighten up the hoods, but I have found the simplest solution is to put a heavy rubber band around the lens barrel that you can slide up behind the extended hood. Currently, the only Nikon lens I have with this problem is my 300mm f/2.8 and I have gaffing tape around the barrel to hold it firmly in the extended position since I rarely retract the hood.