The bayonet pin was missing from one panel and you.were not able to lock the panel closed. Where the pin went to I have no idea. The pin is attached to the locking bar by threads which are inside the bayonet. You may order the bayonets online from the US, which will cost money and take some time to get here.

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So I decided to build my own. I used 1/4″ solid steel pipe, cut it to the extension size needed, drilled a hole in the of one and and tapped threads.When fitting was done I made the the bayonet shape at the exterior end.

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When I first tried to fit the panels they did not fit well and everything needed adjusting to get the best fit.