Just stretch the chain with lots of burnouts and wheelies!!!
Ok, on a serious side. I don’t think I would want to "add" a link. I think it would be better if anything to remove links. But preference would be to purchase the right size chain.
If anyone is questioning my reason, as “stretching it†as it might be.
If you try and add a link you always run a risk of dissimilar metals, or even different strength metals which could / would cause a weak link (you know what they say about weak links in a chain lol.. ehem. Anywho)
If you cant purchase the correct size chain, at least by purchasing a longer chain, not only is it EASIER to remove a link than to add a link, but the chain should still retain it’s integrity providing the chain is not damaged when you remove links.
Just my .02
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