A Question About Structure Supported Slaps

Hello! Lately i started to practice Chopin Etude no 3 op 25 in F major. While i always played good this etude i had problems in the measures that the trill like figurations in the right hand appeared.I am talking about measures 9-16 where the right hand plays fasts 32th notes with fingering 42325.I would like to ask about the thumb and second finger relationship in that measure. With the way the 32th notes are notated -(the last one is notated as quaver too)- can i assume that fingers 1 and 2 support the whole arm thus freeing the other fingers to play fast? I tried when i study this piece to have the initial movement of the hand aproaching the keys like a supported slap.Thumb standing on the f key and other fingers slaping the keys.This helped me but there must be something else i am missing. Sorry for asking such a technical question regarding a chopin piece.I have just been trying to find a good use of the structure supported slap in my repertoire.

Hoo boy, that's some question! First of all not everybody does 42325, some do 32325... Then: every technique I speak about is preparatory. They are all just a phase. If you stand on 1 & 2 to free the others, it is to give the whole hand a sense of functionality such that eventually each finger will work optimally even if you are not standing on anything in particular. Very difficult to tell you what to do without seeing what you are already doing. I might, for instance, tell you to practice with your fingertips extremely close to the keys, using an absolute minimum of movement, and refraining from any sort of structure-supported slap! I don't know what state you're in. However it's a good bet that if you stand on your thumb and especially make it feel its difference and independence from the other four fingers, you won't be doing yourself any harm... Best regards, AFF