I purchased this new 20 years ago and have been storing it. I kept it as a spare part for missing parts of Fernandes TEJ and Hotei models. This roller nut is made of metal, with metal rollers, not plastic. Plastic ones often have problems such as not turning due to deformation caused by deterioration. Since I've never installed this, it's a part for those who are good at modifications. I will include some dimensions on paper. Due to issues such as parts swapping, returns and refunds are not accepted.