How about the rear shelf of bicycles?
Then the iron mouth connected, the middle bar can adjust the length of the screw rod, remember this step not to screw a screw tight adjustment after screwing.
Method for mounting rear shelf of bicycleThe first will be shown below with screws fixed on the frame behind the iron, two iron and iron hole to hole up so.
The rear shelf is fixed on the seat pipe, adjusting the height, and the connecting iron shelf
