I also found a readymade solution on Etsy. Seems like you’re not the only one who wants to join two or more LACK tables together.
The LACK Lock slides over two legs and is held in place with an integrated, low visibility screw. They can even make the locking adapter in a wide variety of colors to match the colour of your LACK tables. The lock can be removed when your son has finished playing. But maybe not as easy to disengage as Velcro or barrel bolts.
Let us know the quick and easy solution you end up with.
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Jules Yap started IKEAHackers.net in 2006 as a personal blog to showcase the most impressive IKEA hacks from all over the world. Since then, she has learned a lot more about power tools and DIY. Her site has helped thousands modify IKEA furniture with step-by-step tutorials, craft projects and home styling.