I am not sure if it supposed to slid up and down that tube but mine does now as the bolt broke.
Bill,
I am suprisid you where even able to get them on the phone ! I have tried for 2 days and the cust service line just hangs up when you "press 2 for Husquvarna"
what number are you using ? I have tried 3, the one in the manuel is not longet correct so they direct you to delaer line,then the cust service one that hangs up.3 call and still can't talk to anyone !