I just wanted to say thank you. I recently bought a 2nd hand 2019 2638. I found it hard to get onto low and medium gear. Then I put it into high and it locked there. I followed your directions, except I put a 50lb bag of cement onto the reverse pedal so I could open the 12mm nut. I then tapped, oiled and greased all the parts and eventually it released. Thank you so much, it's never going into high gear again but it slips in and out of low and medium easily now