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This is a thinking man’s hack. If the string is too stretchy, I reckon a wire coat hanger might be long enough when unfolded 👍
Jonny69-
If the string is too stretchy
I have a spool of Kevlar twine I bought off eBay years ago... Wasn't expensive and comes in handy now and then.
The original purpose was for a DIY electronic shifting setup I was working on, to wrap around servo-mounted spools and run through short lengths of housing to the derailers in place of normal cables.
That much of the idea seemed to be a goer, but the whole point of the project was to enable a half-step triple (38/52/53) - I'd established it could all fit on a double crank with the two big rings really close together and the small ring only slightly inboard of standard... It looked like a winner.
But of course it required a bespoke FD cage and double big ring (the proof of concept setup I did was too flexy and obviously lacked shift-assist cutouts and ramps). Would've been nice though; that chainring combo turns the upwardly-curving line of gear ratio vs gear number into a nearly straight line.
Kimmo
One of my little sheds has a bottom bolt that's annoying as fuck to bend down to lift when you want to open or close the second door.
Tied some builders string to it, threaded through an eye, and wrapped around a stick at the top.