If the PT mini-hoe is made from thin wall tubing as someone has said. I would beef up the arm If the thumb from Ebay doesn't fit exactly, say, to go inside the bucket, he can cut off the end of the thumb, or reposition the bracket enough to fit. The thumb is useful even folded back. If you are there while he is welding, have him clamp it in place and go through the full swing, fold back function.