This is a simple tab I draw in Fusion 360 to hold the rear frame of my bellows for the “4x5 large format camera" project from @KevinValverde_323286
The rear standard design has holes for hexnuts and M3 screws that you can use to bolt those to the camera.
With friction, these will want to turn with the screws, allowing you to install and remove the bellows with a quarter turn of a 2.5mm allen wrench
The author marked this model as their own original creation.