One thing that has been evident from operating my O guage layout Fourgig East at shows is that my makeshift uncoupling hook for 3-link couplings is a bit, well, poor, and I only have one of them so operators have to share!
Having seen 3 Link of this parish's "key idea" ( http://www.rmweb.co.uk/community/index.php?/topic/50279-o-gauge-auto-couplings/&do=findComment&comment=579380) I thought I'd have a go. I first made a plastic mock-up with 1mm sheet and a bit of tube that I squirreled away ages ago. This proved the concept so I went all out in brass to arrive at this:
The fancy end is the "3 Link key"
You will see that I have cranked the end so that hopefully I can get in from above when trains are in the station etc ....
The other is a normal hook for those who prefer it (a hook still works better with screw links in my experience)
A bit of heat shrink makes for a handle and we are away. I have enough spare material to make another, so next time out with Fourgig will be uncoupling heaven (yeah right!)