@John Degnan Is this Inventive Models you are talking about? I bought some of those last year and found them useful and nice to look at, but not overwhelming. At the moment one can find one (empty) offer in the bay with steel balls - just to keep it alive while not able to offer couplers. What kind of magnet do you use? In my german diaspora there are no handy tools I could use. And it is not very funny fiddling around with big magnets over super small couplers.
?
Greetz, Hans
