#1. "RE: D300" | In response to Reply # 0ericbowles Nikonian since 25th Nov 2005Sat 04-Aug-12 10:58 AM
A little bit of Pliobond generally does the trick. Don't use too much - it's messy. You may want to use a toothpick to spread it into the areas that are hard to reach.
A replacement grip with adhesive is available from Nikon Service if needed. Many repairs require the removal of the grip.
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#3. "RE: D300" | In response to Reply # 2ArthurNikonF Registered since 09th Oct 2011Thu 09-Aug-12 03:07 PM
I had mine replaced while still under warranty. This seems to be somewhat of a common issue.
Please read my blog (Nikon, Hasselblad, AND Polaroid), at www.arthurpolaroid.wordpress.com/ Nikon D300, D40, F Photomic Ftn, FE-2, F3HP, N80, F2S
#4. "RE: D300" | In response to Reply # 0
There's an excellent description of how to replace a D300 grip here: