These two plates are glued onto a Probus Fackelmann Magnetic 60 Minutes Stainless Steel Kitchen Cooking Timer (other timers can be used but these are available in the uk for less than £8.) so that a camera can be mounted for do panoramic time lapse videos or anything else that requires slow panning.

I added a cheap iPhone mount to the top to hold my iPhone for doing panned time lapse videos.

Bottom plate prints with threads, top plate requires a 1/4 tripod stud.