i got an old mtb for free and trying to fix it up. but im having trouble with the fork rn. the caps on the top are just rubber bungs (they disintegrated when i removed them), there's no nuts on the bottom, and removing the top caps reveals no spring or anything inside, it looks like there might be a hex bolt all the way at the bottom but i have no tools to reach it. there's no movement its completely seized, heavy af too made of steel. what type of fork is this and how do i service it, bike bros?