An Eco with italic nib. It was working fine when I loaded it a week ago....(Iro Tsysu-Kusa, if it's germane). But when I went to flush it yesterday, it was almost like trying to turn the knob in setting cement.

It comes with a lube kit, I know, but I have never lubed a piston before. Any pointers, please as to how to diagnose and proceed?

Thanks!