I considered swapping just the nib itself on an Edison Collier (it had too fine a nib for me), but then I saw that AP sold the whole nib/feed unit from Edison. If the Edison logo is important to you, pay the extra $10 and get this product. You can simply screw this into the section. Less risky than yanking and reinstalling just the nib.
A pen refresher
Even though my tastes have changed over the last 20 years of fountain pen use, there's still some corner of my mind that insists extra-fine is the way to go. When it finally came time to order a custom-made Edison, I listened to that small voice, and was never quite happy with the result. With this new nib, my gorgeous yellow Glenmont will be seeing a lot more use. Easy to swap out, wrote well immediately, changed my investment from an "ehhhh" to "oh, gosh, I like this".