Feeling that the knob on K/M/A/F Lenses is really useful, I contacted Pentax Germany.
They have spare Knobs for repairing! Will get two. A small hole (more a notch) has to be drilled into the plastic barrel of the FA lenses to secure the knob. It then has to be glued into place. This is good news! Knut - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .