Rotary Strap Angle Adjuster

I'm creating a device used to adjust the rotational angle between two flat straps. I'm envisioning that the overall external shape is cylindrical, with one of the flat sides positioned and oriented along a person's thigh or waist. One strap would be attached near the top of the device, and the other strap would be attached near the bottom of the device. Under normal operation, there is no relative angular motion between the strap attachment points. The user should be able to press a button somewhere along the circumference of the device (likely near front or back since the top and bottom would be occupied by the straps) to allow for relative rotation. Once the user released the button, the device stops allowing relative angular motion, essentially locking into the newly selected angle. The angular range should be +/- 45 degrees from nominal (nominal being the bottom strap on the bottom pointing straight down). I'm expecting the diameter of the device to be around 2 inches. Max load will be low, maybe 3 lb. The device will need some kind of cover to prevent dirt from getting into the mechanism. The button where the person's finger will touch should be rounded for ergonomics. I'm not sure how the device will prevent the inner rotary part from coming out of the housing. Assembly will also need to be considered. For prototype purposes, I would like to minimize fasteners. I'm OK with one-way clips for now.

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