How to fix a hole on the sliding door trail?

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cx5
Hi all. 2010 Mazda 5 here. There's a hole on the sliding door trail because of the rust. And now door gets stuck when opening and closing.

I checked and found no access from the bottom. Currently I plan to weld a piece of metal on top of the hole to cover it. But I'm really not sure if it works or not?

Can anyone please give some suggestions?
Thanks a lot in advance.
 

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