Not much done today, but I did make some more progress in trying to find out the dimensions of the seat locking mechanism. There is just about zero info out there. I had to piece it all from a number of sources, but I finally got on the right track. There is one thing I still need to solve and that's how the factory seat adjusting lever clamps to the bottom of the tube that encloses the seat pin and spring and still has a solid bottom for the spring. If the base is welded to the bottom of the clamp, it can't clamp. Hmmmm...a real head-scratcher. I did borrow a set of seats from a friend to get a better idea how the factory makes the seats. I'll make a hybrid between the factory seats and what Kevin DeShazer came up with in his seat plans.