...but as Simon noted earlier the string spacing is 19mm, which may be pretty wide for a 5er. They have two others that for sure are locking BB285 and BB265. Narrower, but also string-through. They also have one that looks like it has a grub screw for locking on the side, BB008 that is string-on-top and 17mm spacing, but I can't promise it's locking. Then, over course, they have a bunch of 5ers that don't lock, some of which are high mass.
The website is horrible, perhaps because they primarily market to manufacturers rather than individuals. I have seen their products sold in a lot of places. I got my first one on eBay. I got my second one on AliExpress, and thought I might grow old and die before it arrived. I have found them on a number of other websites as well. You can also sometimes find them using "Wilkinson" as a key word...because apparently Sung Il also builds some hardware for Wilkinson...
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