I have three brand new 140kv 6374s for sale. These were purchased for a robotics project, but ended up being extra. All three motors are bnib. I used three of these for the project and was very impressed, flipsky motors have gotten quite good!
75 each plus shipping, or all three for $200 shipped (within the US).
So odd. Does that mean you need to use a 3mm keyway in non ideal locking? Seems like it would be difficult to find pulleys with non 3mm standard keyways