This happened the very first night I brought home my Warwick Corvette Standard Fretless.

I was changing the strings (because they sell them in-store with roundwounds, the morons, they chew up the neck!) and I noticed the tab on the floor later. So we looked on the internet, and found out about the program where they offered the replacement Just-A-Nut III for the Just-A-Nut II. Before I had time for a brief celebration, I read that the program ended in August of 2007. I don't recall the link, but you can probably find it on the Warwick website. My nut is still on the bass, even with the tab off, but I'd like to replace it when I get a chance.