Door lock cap 48 mm diameter + lock turning knob
thingiverse
Copied the original broken part by measuring and designing in Fusion 360. The knob was so broken I could copy it but I designed one that works great. Used the original screws (6 mm long M2 oval-head screws). I also put a bit of white acrylic paint on the vacant/occupied plane bc it had faded to ugly yellow. The lock works by turning a 5 mm wide rectangular metal rod and the knob was force-fitted on top of it. I could have rotated the knob design 45 degrees so it would be straight when locked but hey, afterthought :)
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