A couple years back I purchased an Epi Nikki Sixx Blackbird. Everything about the bass was killer for the money except one major design flaw. The bass is light, evil, loud, simple and has about the best action of any of my basses. The Deep Sixx pickups have incredibly deep, low tones. Fatastic bass for the price. I play Warwick, Jackson and a Steve Harris Signature Precision. However the neck dive on the Blackbird was so bad and embarrassing that I gave the bass to my daughter. Heck Nikki even had to add a bracket to hook his pinky in to hold the bass up to make it playable. Mine was just unplayable in my view. Today she needed cash so I bought the bass from her. I was told at guitar Center that to make the Thunderbirds work all you needed to do was place the stap button in the northeast screw hole on the neck plate. After drilling out a perfectly good Ernie ball strap lock to accomidate the larger screw I tried that. BS man the bass still has the neck dive and at best rides level. Level won't work for me! So I just took the original strap button screw and button and took a chance on another placement - no science here. I placed it in the lower horn pocket curve below the neck at an angle so that the screw was headed toward the neck pocket. Holy Sh** man this is now a workable and completely perfect playable instrument. Why in the world Gibson and Epi have not thought of this improved location before and made their players do surgery on the instruments is beyond me. I have just played this for two hours and it is now my favorite axe. Wow a simple strap button placement has transformed this into a great player. Hope this helps some of you.