New trick for this old dog
New for me - probably well known to others but just in case.........
While head down and A... up inside a cupboard trying to measure - the idea struck me.
Having recently pulled an old radio cassette to bits [great source of small bolts, nuts and screws] I kept the antenna. Being an oldie it is quite solid and firm to extend and retract.
I managed to make all of the measurements I needed, transferred them to my ruler and you know who was my uncle.
I have since dug out a couple of other antennas of varying lengths which should come in handy for all sorts of bits and pieces including checking the diagonals of boxes and drawers etc.
Regards,
Bob