I hope your cherry black board is not plate mounted..
Oh wait it is, you said it's in a filco.
It's no small feat to do a spring swap on a filco board, because they are plate mounted and the cherry switch cannot be popped off easily. Plate mounted cherry boards are pretty easy to swap, not plate mounted ones like the filco.
![Sad :(](https://cdn.geekhack.org/Smileys/solosmileys/sad.gif)
My understanding is that if you wish to undertake this feat, you need to open the board, desolder the switches from the plate, pop them out, open them up, place springs from a cherry brown or cherry blue board, then close the switch, then resolder the switch into the original position. Repeat x 104 times.