"Twin Tangle" solution?

Hi,
Does anyone know how to solve the “Twin Tangle” puzzle? I bought one of these at the w/end, and am totally stumped.

Here’s the puzzle. Although this page says “solution enclosed”, the version sold in the UK doesn’t come with any solution.

There appears to be no solution that doesn’t involve an incredible amount of force, way more than my arms can generate, to slide the two bits of metal ‘through’ each other. Yet the puzzle is sold as ‘for ages 8 and up’.

Yes this is humiliating!

… that this should be in IMHO. Apols to mods if hunch correct.