Kickstart shaft and return spring

Afternoon all,
I am fitting a new kickstart shaft and return spring to my 66 series 3 special, when turning the shaft in a vice to the ramp it goes solid and won’t go any further, am I doing anything wrong?.
Thanks in advance
I am fitting a new kickstart shaft and return spring to my 66 series 3 special, when turning the shaft in a vice to the ramp it goes solid and won’t go any further, am I doing anything wrong?.
Thanks in advance