I noticed my swingarm had some play in it on my 2004 450EXC. I decided to check the shock to see if it's bearings need replacing as well. The lower mount had no noticeable play and the upper mount had a little bit both side to side and up and down. I did a quick search and found a thread saying side to side play was normal but I don't know about the up and down movement. Will I need to replace that as well? I saw a tool online (Morgan's Tool) for changing swingarm bearings that looks to basically be a big bolt with some spacers/washers for pushing the bearings in/out. Does that tool need to be very precise to seat the bearings correctly or would it be reasonable to DIY one with some stuff from a hardware store?