More on IF transformers

 

This is what is inside the can. One core two pie wound coils. Not a very hobby friend device to build.

The brave at heart could do it like this 2 and 3 makes a coil former that can be 'jumble' wound. For a one off production this will work but the jumble wind is not reproducible. (It will need adjustment.)

You can design a single layer coil using this nemograph and a good wire chart.

such as this one.

One more found on the web put in a can and ready to use.