I am having an issue with our Uni I—it has a squeaky rider roller.  I took a look at an old post, ‘Inking Roller Squeal,’ and that was helpful, but I have an additional question.  The black knob at the end of the rider is loose, but when it is held in place, the squealing stops–Is there a way to tighten this?  I don’t see a set screw, so does the whole rider roller have to be removed to examine the handle?

Thanks!

Sara P