To do that you need one thing if I am right. Add a timeline. Double click on it. There will be a loop checkbox around the top middle. Enable looping. Exit the timeline. Plug the Attach To Component execution wire into the start on the timeline. Plug the timelines Update output into the Set Attach End To node. This should work. By the way your way of doing it is very unlogical for me. I will do my own setup. I would create different bps for the 2 Players. In your case there are 2 cables in the world when you only need one. This might cause further issues.