How to Downgrade. The essense of getting power gear

First i just wanna say that i will try to make it as clear as possible.

Lets say your base weapon (The one that u use) has maybe 15 mp recovery. Then you have to make a fuser with HIGHER mp recovery then your base weapon so let say you got a AAA fuser with 20 mp recovery. Then you will have to make another fuser but this time a fuser with LOWER mp rec then your base weapon, now you're done with upgrading. What you have to do now is to go to the Blacksmith (A.K.A BS) and press Stat Transfer. In the first window that pops up you put your base weapon and press next. Then it will open a different window where you put the fuser with HIGHER mp rec then your base weapon and you will now see to the right many red lines and one green line with means that you can increase the mp recovery and you press on the green line (mp recovery) and DO NOT press transfer, now you take your fuser with LOWER mp recovery then your base weapon and replace it with the fuser with HIGHER mp recovery then your base weapon, now you can press transfer and you will now see that your mp recovery has went down a few "mp recoverys" and the upgrade level will now be at 0 so you can upgrade it to 10+ again.

Hope i made it clear for you and if you have any questions don't mind posting them here.