Hi today i tried to adjust the pressure in my spheres to try and soften the ride as its very hard.i loosened the bolt on the end od the sphere very slowly to release abit of gas but there was no gas only hydraulic fluid.Does this mean the my spheres need replacing ?ifso Does anyone on here a pair that there willing to sell or wheres the best place to get them from? and how much will i have to pay? thanks Damien