ouch........
yes was gonna say before you pulled it all out, there should be a grub /allen screwto remove and pour oill in, hence the syringe i mentioned earlier.
Been thinking about that clunk...........looks like the only top out bumber your have is the rubber thing that looks like a dogs nose..........perhaps it was in the right way before, but it strikes me the 'it' has to be the 1st thing that gets hit when the inner legs return upwards and the rod inside the fork is pulling way in the other direction....and seating above the c-clip and washer
When you put it back together or if you can see how it was to me the'dogs nose' should be lower than the black splined plastic thing...if they were together...........perhaps they are the wrong way round and hard plastic is getting slapped 1st instead of soft rubber.