here are some cutoms i wanted to show

[Therealblack64YT]

ok so the metal spring is put in the red end were the coupling will stop and then I closed it 
so the picture is here

[Super]

I am not sure what I am looking at here

[DalaGStanator]

Context:
 

It took me a while to realize that custom coupling was a spring; I thought it was a wire tie like the way I brought separate tenders closer to the cabs. Your method looks better since I kept the hooks while you found a solution for the lack of another peg. I'd like to see how you attached it.

 

eagle was made using my old trackmaster 2013 [2012] james and wanted couplings so I used a spring that was from a happy meal toy from the Book of life it is also my old james because of the white painted that is seen it was then repainted black
The picture of the spring I with a hole so I put the spring there and then screw the white

 

Sorry, but you showed the wrong end. I was referring to the front of the tender where the hook coupling was. I asked because the hook couplings are hinged using slots on the sides and only the eye ones are mounted on pegs (which makes it slightly harder to fit a coupling with a different attachment method). Hope this clears it up.

 

well it had a truck coupling so I pulled the spring way more back. also it is where theres a big red block to hold the wheels that's where I stretched the spring