Anyway if something doesn't work, take it all apart, give it a damn good clean, look at it really hard, put it all back together and after all that if it nearly works then fiddle with the adjustments and if it doesn't work then take it all apart again and look at it again but HARDER this time until you go "oh, THERE you are you little bollocks, such a tiny thing causing all these problems." This works for any problem, good night