Delayed Action Tension Lock Couplings
Thank you for your interest in my modified tension lock couplers. The method I use is not my own idea but inspired by a suggestion in Railway Modeller about forty years ago. My development of the idea was to make them single ended and so usable on sharp radius curves (250mm/10" in the case of "Portpyn").
I first used the modification on an O-16.5 layout I built many years ago and have since used it on my two 1:34 scale and two 1:25 scale exhibition layouts listed below.
You are quite right that Richard Williams used the same method.
To assist you I have just created a folder in the "Files" section with drawings showing how the modifications are made. I think it will be fairly self explanatory.
Christopher Payne UK
"St Pierre" 1:34e
"Sutton Wharf" 1:25
"Paradise Mining Co" 1:25