I recently helped someone with his SP-15. One of his problems was that one of the roller height adjustment knobs had broken due to an impact. His press had knobs of solid plastic, sort of pear-shaped with a tapered stem.
I was recently trying to set the form (inking) roller height on an SP15 and found that I was unable to properly set the gear-driven one (nearer the impression drum). There was no way the back end (closer to the