After a days riding at a track I noticed that my spuspension needed to be looked after. The back suspension only needed some adjustments but the forks was in need for some more attention.

While reassembling the forks I came to think about the compression, since the rebound has a adjustiing screw as well as the preload, but I could not find out how to adjust the compression. So is there any of you guys who knows how to adjust it? Not that I really need to, I'm just curious.
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MC21, GP-Replica (Daijiro Kato, Telefonica Movistar Team 2001)