I found the locking clamp used to adjust and lock the captain's seat on my 98 Jubilee through Springfield Marine at
www.springfieldgrp.com/. They then forwarded me (within 1/2 hour) to the Cascade Depot
http://www.cascadedepot.com/ for the handle assembly. I had it on order in 5 minutes, and I've been looking for this part for 2 years!