I was referring to the "ridge" or "flat spot" with the extra bump out on the stabilizer by the knurled thumb screw. Most I've seen are rounded all the way around
Do you know which years they included the flat ridge on top of the stabilizer? The only other one I noticed it on was the offset one you recently posted. My initial thought was just the first few years had this included, but now I am confused.
I may possibly put the above wrench up for sale...
I hope this can help as I haven't seen any of these models shown in the thread. Going through everything, I believe this could be a model from around 1927 as it has the Pat. Pend'g with no swash plate.
Let me know what you guys think.