One method from the OLD T-Bird forum:
http://www.lysator.liu.se/~wizkid/mu...underbird_mod/
In case you've others or want options, here's my preference:
on all TBirds
Watch out for this(only happened on one Epi out of 3). Fixed with Crazy Glue gel.
If it starts, you'll notice your action getting higher,etc. while you're playing. STOP after that song(if at a show) and check. It possibly could "launch"(been there, done that on a 60's T-Bird when screws pulled loose. See pic directly above bottom left for how I cured that one for good).
Enjoy your T-Bird and prepare for the "Why don't you play a Fender?" or similar buzzing in your ears. Heck with 'em. Play what YOU like.