In the air inlet opening there is a pin which has to be pushed in with force until the upper part jumps out slightly. You can then remove the upper part to screw in the screws. Make sure that the spring is sitting straight on the inner washer and is not jammed.
The lower tube has a diameter of 4.5 cm:
The disc has a diameter of approx. 9 cm.
The hole spacing of the opposite holes is 8 cm.
The length of the threaded screws is 4 cm.
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