Or you could try the search facility tab at the top of the page using words like forks, stiffening, & springs & you will find a whole heap of useful stuff.
Please ignore the first suggestion, I only say this because on Sunday I meet someone who had done just that. I kid thee not.
Yeah well he said he didn’t like the front end moving all around the place. Ok it had a BIT of movement so they weren’t quite full. Can’t imagine he’d have any fillings left though.
Actually thinking back when I was a kid I had a friend turn up on a RD350 road bike & even as a 15yrld I knew that the forks weren’t supposed to be solid. His too were filled to the brim so I pumped some out with a dispensing pump & he couldn’t believe what a good idea that was to have some air space at the top of the forks!!