Gretsch Guitar Tech Tip Videos Watch as Master Gretsch Guitar Tech Brian Thrasher takes us through the fine points of getting the most out of our Gretsch Guitars. Optimizing a Gretsch G5120 Electromatic for tone and playability. Intonating a Rocking Bar Bridge equipped Gretsch Guitar. Restringing a locking tuner equipped Gretsch Guitar. Restringing a Bigsby® equipped Gretsch Guitar. Adjusting the truss rod on a Gretsch Guitar. Gretsch E-mail News | Find a Dealer | Privacy Policy | Terms of Use © Gretsch Guitars