magnum cam extension from hughes?

They require you to machine the outer collar isn't the best thing in the world.

What they should do is set up the CNC to cut that with 4-5 varying depths so the customer doesn't have to remachine stuff. I took a square file to mine, making a fresh keyway at the required depth.

Another thing that may make things better is to pull the woodruff key from the camshaft and square the end which that smaller key butts against.

I too did the WTF is this look and how does it go together.