In the process of upgrading my front shock springs with progressive ones, I realised that the inner tubes are badly scratched. Under heavy load and bad road surfaces, the tubes may dive deeper and these scratches can damage the oil seals. Once these seals start leaking, it doesn’t take much for the oil inside the forks to drain and become unrideable. So I decided to renew the tubes with new ones even though it would cost me $450. But it turns out that the tubes are backordered, meaning that theya re not available anywhere in the US for a long time. My best chance was to sand the surface with a fine wet sandpaper and polish them. You can still see the dents but they don’t protrude as much. I’ll be fitting an old style fork gaiter to avoid further damage from bits of rocks and gravel.