Do not play the notes immediately. Tap the rhythm on the fallboard (the wooden part of the piano). Pozzoli uses dotted rhythms and syncopation frequently. If your rhythm is wrong, the "mechanism" fails.
The book typically contains (in full editions) and follows a progressive difficulty curve. Pozzoli, Ettore - Ricordi pozzoli 24 studi di facile meccanismo pdf
Cerca sempre edizioni legali e rispettose del diritto d’autore: Do not play the notes immediately
Play the study with swung rhythms (dotted eighth + sixteenth) to fix uneven fingers. Do this for all 24 studies. pozzoli 24 studi di facile meccanismo pdf