I'm sure you could find a tutorial somewhere that tells you how to remove the fire effect. However, did you change the flag so that the hammers don't have a "fire" effect from hitting someone?
i can´t find a tutorial but i still keep looking and i just swapped fireball model/Animation to hammers and i meant more remove the fire on the hammers then they are casted it looks like fire hammers i not meant so much then they hitting if i can do it that with only FitXXXXXMotion.pac or only the 3 files for fireballs in FitXXXXXMotion.pac you only needing to replace it can be fine so it can work with other PSA´s with fireballs like the new capped mario PSA with hammers