I've been practicing by metal commsa. The tricks I can do are charge, sonic, sonic inverse, thumbaround, viper, infinity. after I modded my faber castel multimark(added two multimark caps and added fabercastel grip matic tips and grips). I realized that I better perform these trics with my faber mod. So I should practice new tricks and go on with my faber mod or I should stick with metal commsa? Thx a lot for the answers