Nuts 'n' Bolts (Insane) is the first stage in Techneurosis.
Strategy (This Stage Only)
An incredibly efficient way to do this level is to spam Catasaurus and Hoop Cat, since you most likely have them before you try this stage, so the large amount of hoop cats should constantly freeze Metal Cyclone while Catasaurus keeps making critical hits and finish off Metal Cyclone.
Strategy (Both Stages)
Line-up for both levels: 3 Meatshields, Catasaurus (Crit Up), Corrupted Psychocat, Waitress Cat, Seafarer Cat, Voli, Hurricat, Lufalan Pasalan.