Greencorn,
Here are 2 photos of the spare and mount on my '36FB. I don't know if they are exactly the same as a '34-'35, but I also have the lower strap with the horizontal slot on the outside and a longer one with a hole on the inside, but I really don't know their purpose (maybe to secure a cover?).
![[Linked Image from i292.photobucket.com]](http://i292.photobucket.com/albums/mm24/winowally/Spare%20Tire%20Mount/IMG_1097.jpg)
The key lock assembly is at the top of a rod mounted thru the fender to the fender support. When the lock is opened it releases the lock assembly from the rod, and you can then remove the upper hold-down and remove the spare tire from the wheel well.
Hope this is of some help, if not send me a PM. My address is in my Users file.