This tripod quick release was designed to attach to a Davis and Sanford (Tiffen) ProVista tripod with an FM18 Fluid Head.
The four mounting holes will accept ¼-20 nuts. Use with nuts if offsetting the telescope to one side of the tripod.
Print with supports.
I printed this with Prusament PC Blend for strength, ymmv with other materials.
The author hasn't provided the model origin yet.