I just picked up an Imperia 150 second-hand and the cutter attachment is in less-than-ideal shape. There's rust inside the handle attachment points, there was a lot of dried dough stuck in the cutter grooves and it seems like there is dough wedged under the scraper bars. I spent a couple of hours with some bamboo skewers and a stiff brush and got everything I could. I ran a batch of dough through to pick up the bits and after all that, I can't get to what's under the scraper bars, and there's a definite issue with the gears - a resistance at one point with every turn.
I'm toying with the idea of taking the cutter attachment apart. I'm ok with losing it, as it's really not functional as is. The main part of the machine is in great shape, and I can always pick up a chitarra. I'm just looking for someone who has done this and can offer some hints.