I've installed an HE6C 3/8'' Clover Key Ultralite Bass Xtender on my Mike Lull Modern 4 Jazz Bass that replaced the stock E-string Tuner from a set of Hipshot HE6C Ultralight Tuners that the Bass was equipped with originally. Besides the stock set of HE6C Clover Key Tuners, it and nearly all of Mike Lull Custom Basses also come from the factory with a Hipshot Aluminum A-Style Bridge as well (or depending on the model, the more modern-looking HE6Y "Y-Key" Tuners and/or more vintage-sound Brass version of the bridge), which for me was a strong factor in choosing my Mike Lull Custom Jazz-style Basses - besides the aforementioned M4 I own a "Modern 5" 5-string and have about 5 different models on my "to-buy" list. Between the enclosed printed instructions and the online installation videos that can be found on Hipshot.com and YouTube, the stock Tuner was replaced with the Xtender in very little time & was an extremely easy "drop-in" installation with clear instructions and no need for the time and money for a Tech to install and "dial in" the Xtender's slight pitch change when initially dropping from E to D and returning before quickly becoming stable and in tune *all the time*, whether the Xtender was engaged or disengaged and repeating several THOUSAND times before an accidental turn of the Tuner or a String Change has it becoming in need of a quick "dialing-in" once again. The Hipshot Bass Xtender, or "D-Tuner" as it's fondly also known as for the most common and musically useful setting between notes, has certainly reached "classic" status as an Electric Bass product and Aftermarket Upgrade that bassists have used to extend the range of whatever basses they're playing since 1984 whether it be the E-to-D on the venerable 4-string, low B-A on the now common 5 & 6-string, low F#-low E (an octave below the 4-string's E) and other alternate tunings both low and high, and the fusion of The Bass Xtender with the Ultralite Series of tuners has brought it into the 21st Century even better... as well as significantly lighter.
These are reliable, beautiful and very well made. The "Double Drop" option is incredible! Once it is set up, which is easy, you will have FUN with this option.
I have 3 Hipshot Ultralite Bass Xtenders installe on various basses: a GB7 to replace the stock Gotoh mini-tuner on a Spector ReBop 4 DLX EX, and an HE6C "Clover-Key" & HE6Y "Y-Key" that replaced the stock Hipstock Ultralight Tuners on Mike Lull Modern 4 & 5-string basses. All were extremely easy "drop-in" installations with clear instructions and no need for the time and money for a Tech to oversee. Between the instructions and the online installation videos that can be found on Hipshot.com and YouTube, the stock tuner was replaced with the Xtender in no time, and the instructions that are *key* for setting it up to stay in tune in either position as well as after multiple flips of the Thumb Level were easy to follow and had my basses in tune *all the time*, whether the Xtender was engaged or disengaged. The Hipshot Bass Xtender is now a "classic" product that bassists have used to extend the range of whatever basses they're playing since 1984 whether it be a low-E, B, or other alternate tuning, and the fusion of it to the Ultralite Series of lightweight tuners has brought it into the 21st Century better... as well as significantly lighter.