The rear shocks on the TRX700XX are not servicable. I tried to mess with that plug thinking it was an adjustment, turns out the o-ring was dried and stuck, when I found out that it wasn't an adjustment, it started to leak. I tried to tighten the plug but the leak didn't stop. Took it back to the dealer, they had to order an entire new shock assembly from Honda directly. I looked at the fishe at the dealer, the internal components of the rear shocks are not identified and have no part number. The only part number is for the entire assembly.