On [this page](http://jeroenthesseling.com/gear.htm) of Jeroen Thesseling's website, it lists a Warwick Thumb NT 7 String as one of his basses. And Jeroen says this about the NT 7 in [this interviw](http://www.notreble.com/buzz/2011/11/17/ultra-low-an-interview-with-jeroen-paul-thesseling/): "You have to get used to this instrument because the neck is broader and it’s heavier. It’s even heavier than the regular 6-string neck-thru Thumb. It’s quite a job to handle the instrument but it’s worth it."more
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