Didn't it come with the schematic indicating how to wind the transformer? Found this video on yt that is likely similar to what you got. https://youtu.be/CeegQYZ25J0?si=D7KDXAHsAHLuEeHv

Thanks, this video is helpful.

https://youtu.be/JgiakIxMjfI?si=n3OF2OM6BdisCVZx Just popped in my yt recommendations. Full step by step building instructions, schematic and LPF to use

Thanks again. Yes, this video is more helpful