Well, I hate to have you make a mess but it makes a huge difference in what type of cylinder you have. A standard upright (2 stage) cylinder is very simple to repack, a full free lift cylinder is a completely different animal which is pretty complex. The difference is how far the forks rise before the inner channel begins to rise. A standard upright will only allow the forks to raise approx 12" before channels raise, a full free simple will allow the forks to raise the entire height of the inner channel before the channel begins to move.

To be able to answer your question I need to know which upright you have