Doing a DIY float shock service. I have let out all of the air (a small amount of fluid came out of the valve). The air can is unscrewing ok all the way out but I am unable to pull it off. It is like there is some sort of vacuum. All of the oil has come out of the can where I have unscrewed it and I can see the top of the threads of the can so I know it is unscrewed all the way.

What’s going wrong please?

Pull harder.

Have you taken the spacers out of the lower eyelet? If so clamp adjuster end eyelet in a vice ( with soft jaws) and pull the can off

Yes I had done that. I have just managed to get it off. It just needed more force. Thanks for your help