I designed this adapter for my tripod so that I could easily and quickly swap out accessories on my tripod. I could leave the mount that came with the tripod on my camera at all times and quickly switch between my camera and my iPhone mount with the use of these D-Rings:

https://www.amazon.com/gp/product/B00KI3J7G2/ref=as_li_ss_tl?ie=UTF8&psc=1&linkCode=sl1&tag=modernhobbyis-20&linkId=877a3a1e7f66083990a132e28c8ff068&language=en_US