They are 1 1/4" (c33mm) diameter and XYL had just finished BOTH the tin foil and the cling film so I had a pair of identical cardboard tubes.
A quick test and I can slide the tubes inside the mini-slinky and stretch it out and connect to it along the length (about 12"/300mm). You cannot actually solder to it but you can wind wire about it and solder that in place.
So I am going to make a couple of multi tap inductors for antenna experiments..
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