ZX81 printer repair?

following on from the last video I decided to try to improve the zx printer. The two problems are: 1) When printing the motor straing and wasn't very fast 2) The stylus's (or stylii ?) are not quite in alignment. As you will see I fixed the slow motor but not the stylus. I give a quick demo of it printing some text. Please adjust your volume down when it starts printing as it is very noisy! you have been warned