Good Luck! I thought my cylinders were in good shape. When I was rebuilding my top frame I ran the top up and down about fifty times to get the frame just right. Both cylinders were working good with just a little bypass when one cylinder locked up. I thought for sure that I could rebuild the cylinders. I got out my trusty repair manual and they said replace not rebuild. Now when I think about how many times that the top will go up and down I'm glad the cylinder locked up and forced me to buy new ones.
Jim