I have just finished a complete tear down, ( motor and all) of this 1984 XR250 R. I only have the front forks left to rebuild, but I can not get the bolt out the bottom of the fork to release the dampening shaft. This is making it imposible to remove and replace the Oil seals on the forks. I hit it with an impact with the forks assembled like the book says and after the impact worked at it for a bit it loosened just enough to spin internally. By the looks of the fork oil that came out, the fork has never been apart and the bolt may have rusted to the inner workings. Do I need to drill out the bolt head to get them apart?