On most other dirtbikes/motorcycles I've worked on, the swing arm becomes completely flaccid and falls down if you take the rear suspension linkages off. But on the 70, it actually take a good amount of force to move the swing arm around once it's tightened down. Is this normal? I'm assuming because any modern bike uses bearings and this bike is just simply bushings. I removed all the rust and re-greased the pivot bolt and its still pretty tights. Does the rubber bushing simply stretch and compress to allow for swing arm movement? Or is there actually a spinning action that is supposed to happen like a bearing? Thanks is advance! Also, do bushings need maintenance? Obviously they can be replaced, but can you spray penetrating oil to lubricate the spaces between the metal and rubber?