There's a guy on Ebay and his company's name is VERY appropriate. I'm not making this up. It's called "Dickhead Designs." I've seen his auctions and ignored them for the most part, but I had a customer who liked the look of his necks and wanted to know if he ever made Jazz necks. I wrote him and asked if they made Jazz bass necks and I swear on my mother's grave, this is his answer: "We have found that the jazz necks are to weak and lack sufficient tone." #1, He doesn't even know to use "too" instead of "to," and how does anyone come up with this kind of lunacy? Yeah, Jaco and a few million other bass players can't get any tone out of a Jazz bass! I won't put the link, but if you look under bass necks and put in the term, "roasted," you should find it.