Found this old photo of a bike that I tried to buy years ago. Don't have a picture of other side, but I suspect the clutch linkage is similar to Leitner's. This one is a belt drive, though. I think this is 1911. Small timing cover, open magneto, early style fork, small toolbox. In 1912 (I think) they went to the big timing gear cover, similar to my bike. If there is a Thor expert, or even slightly educated, jump in! I am WAY out on a limb here, and I can hear cracking.