Myron B - I have no trouble reading my TC-157, Revision No. 25, Issued 3-'92. I checked both the 149 listing and the 169 listing. Both show the diagram item no. 3 to be Part No. IH-19837-R1, Pin, 1/4 x 1-1/2, Dowel, and Qty 1.
I only ever had trouble with one of these pins, and I think it was more slippery than loose, so I like Lewis Do-Dah's idea of getting it a little rusty. Back when I fixed mine I just added a few flattening hits on each end of the pin after it was installed. It had some appearance of being rounded over and mis-shapen. It never came out after that.