One of he problems I faced operating Blackney was the 3 link couplings, whilst occasionally I could couple or uncouple in a matter of seconds with a an un-coupler made of bent wire, sometimes it could take several minutes (or that's what it felt like) and it rather took the fun out of playing oops operating the layout. Then upon reading the good Capt's post in his Kernow Kontinum thread. about how he made a magnetic un-coupler with one of those tiny strong magnets. It was like the curtain had lifted. The only problem was that nearly all my stock has/had brass (ie non magnetic) 3links. I decide to make some as I had some 1mm iron wire.
First make a jig using one of the Parkside links basically 2 small panel pins in a piece of wood, one with the head cut off to be able to get the link off.
The wire was then bent round the first nail using fingers and pliers.
Then further wrapping with fingers but mainly pliers. until a loop had been formed.
Then slip off the jig and cut through the overlap leaving a single link.
Amazingly within a tad they are the same size as the Parkside ones.
Now to order the magnets and some brass tubing. I'll let you know how I get on.