Also you don't need anywhere like a whole meter of threaded rod, only need a handful (should that be hand length?) more than your bolt length.
I guess in theory you can drop it down, and hope it comes out of the bottom, but a standard meter rod only costs £1, and makes it easier.
@H-Bomb started
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I guess in theory you can drop it down, and hope it comes out of the bottom, but a standard meter rod only costs £1, and makes it easier.