Here is my question on filling the lever shocks. Mine have no fill plug as pictured in manual. It states "remove rear cover and replace cover with one that has a fill plug". I guess mine have never been removed or filled since the plug isn't there. Can they be filled any other way? Can you get these covers with the fill plug as pictured anywhere? Carter doesn't list them. Has anyone drilled and taped the cover for a plug to fill the shock? Appreciate the input