I built this hydraulic thumb for my backhoe and finished it last summer. This project is covered in the John Deere Tractor forum here. I owe a great deal of thanks to everybody in the JD forum who provided valuable advice with figuring this out. I'm linking this here since people in this build-it-yourself forum may not have seen it. https://www.tractorbynet.com/forums...g/380392-building-thumb-model-48-backhoe.html