I rebuilt my rear shock the other day. All went well except I seem to have a tiny bit of air left in it. I've rebuilt lots of forks, as well has hundreds, if not over a thousand, hydraulic cylinders so I am no dummy to the process, but this was my first rear/atv shock. I did it as per the service manual but when fully contracted I can feel an easy spot where there must be air. Are there any tricks to getting the air out? I haven't charged the bladder yet.