It isn't a BMB service. It is just something I do to help folks out. I got to see a whole bunch of ways it was done by others, didn't like any of them, came up with my own way and had parts built along with custom tooling to do it.
You can send me a knuckle or I can do one that I have, you do the swap and then send me the one you removed. Bonus is I check the sliders for divots and fix those if they are bad at the same time but only on the ones in my stash. If you want me to fix yours, I charge a bunch for that. I'm well into my second batch of a 100 inserts I have made at a time.