The Fender ones (made by Schaller, I guess) are very good. Safer than Dunlop's. There's a mechanism that you need to LIFT instead of pushing. They look a little bulky but they're not. You "slide" it in and also there's the ball-bearing lock (how to resize the picture)?
![](http://static.musiciansfriend.com/derivates/6/001/209/621/DV019_Jpg_Regular_360389.377_nickel.jpg)
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