My Puck Bed extension brass continuous hinge has rusted and the screws just turn in the wood and cannot hold the flap any longer. I can turn the flap upside down and re-connect the hinge again but I wonder if a wider hinge would be better.
Also if I wanted to replace the extension with a new one where could I get the same wood

So much for it being brass! Obviously just brassed steel. What width is it? I have a lot of lengths of stainless steel continuous hinge and i'd be happy to let you have a length if that helped? (I once needed one length, but had to buy 20...) All I need to know is the width and length - the hinge I have has no screw holes in so it can be drilled to fit - shifting the mounting holes would enable the original wood to be reused. Let me know if that's off any interest.

Simon

Check it with a magnet - it's the only way to tell - brass-coated steel is very common Lots of brass bedsteads are steel tubes with brass sheet wrapped around the steel. And a lot of "brass" screws today are coated steel - particularly crosshead screws. Much cheaper to make and looks good until it gets wet...