Update on Whidden tool heads. They are crap. I have three for my 550. All three rock when pushed tight up against the press. My pet machinist took one and recut the top of the tenon dead flat. The high spots were 0.017" higher than the low spots. Crazy bad. The newly flattened toolhead displayed no rock in the press at all. I'm going to have him cut the other two, then we're considering offering the same product but with actual good machining processes used. Sheesh, I hate it when I pay extra for an "improvement" that actually makes something perform worse than the OEM gear.