My bike has 46,000 0n it and front forks bottom out easily. I bought two containers of harley fork fluid/tuneup. I have the 97/98 harley manual but besides a schematic drawing and a little bit on removal,disassembly the isn't much info. What I really would like to try is to just drain the old fluid and replace it with new. I see on the drawing wher the drain screw is but can't see where you install new. Any thoughts on what I am doing?