You have to be careful not to put more than 3 or else you can warp the hatch however.
I had a consistent problem when I got my car (used 19k miles) and put the pennies in, it was fine for a few months, just had my first failure. Naturally I was balancing a pile of loose posters in one hand while trying to open the hatch with the other :/
I'll give it a few more failures before I take the pennies out and go for Nissan's fix.
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