photo #747048

Anybody help a brother out? All the other places worked, I was never in charge of ordering any tooling. This is where I probably struggle the most where I'm at now being the only machinist and programming everything at controls.What insert and/or holder would you use to turn these funky threads? Engineer says it's a spring thread. Was planning on using an OD thread insert if they make one. My threading tool holder take insert 16ERM XX UN 908IC if that helps.I asked about the TPI not being called out and he kinda made me feel stupid saying I could figure that out by the pitch...?Jokes on him tho. I am stupid...lol