Used with a K43 racquet and was very happy. There is no break on the extreme left tail where the snaffle comes out. Good product and a bit pricey (until you see rock bottom prices)!
I ordered this bit in 2015 as a backup and just put it to use today and the bearing is the wrong size. That should be something for the Keller 1600, but the stock is too big for the template. Too late to send back