The product arrived defective. The collet nut has not been properly machined causing the collet to not seat properly in the holder. This wasn't a simple problem of higher beats, it rendered the product unusable. I have since ordered a replacement and will update when it arrives.
later as both the product photo and the description are incorrect. I will change when the seller updates the product listing. Tie rod thread M12x1.75 (like most MK3 collets). It's not 1/2-13 as other reviewers have pointed out. - Machining is good, TIR < 0.001" - Uses a standard ER40UM nut (not the hex nut shown in the product image) - The wrench provided is a general purpose C-hook wrench (not a true ER40) - Wrong thread (3/8"-16) Laser engraving on the part - A few burrs around the threads
Just a warning, the product description is different from the one sent to me when I ordered. 1) The picture shows a hexagonal top. Mine is made for use with a box wrench (the box wrench was included so it doesn't matter) 2) The drawbar description above is for 3/8" 16 threads per inch (which is what my factory uses). cartridge, which I received requires a 1/2" 13 tpi drawbar. I can't tell you how it works until I fix the drawbar issue. However, it fits my ER-40 collets perfectly!