Funny, I just had the same part break in the same place on an Aeroworks P51 with the Robart tailwheel. When I pulled the part off of another Robart tailwheel I had waiting on another project I was amazed at how thin the metal is in this area. This is a design change from some of the older Robart gear I have and it's pretty obvious to me that none of them are going to last long.