I just got my 1st Les Paul in over 20 years. It's a 2016 USA Gibson Studio but so far I really like it! It has the Gibson "green key" stock tuners. I remember upgrading my tuners to Grover Rotomatics on one I owned in the 1990s, but these days prefer locking tuners. What are the "ones to get?" I want a drop in, no modifications needed set. Please be as specific as you can be, thanks.