On Mon, 10 Feb 2020 20:32:56 -0000, Brian Gaff \(Sofa 2\) wrote:

However remember if these wheels are not capped by a curved piece of
something, the most likely failure mode is the cable jumping off the
pulley completely.

Seems it only needs tug so tension could be maintained with a curtain
pull cord tensioner.

I'm doubtfull about how much force of the tug on the cord by the door
will make it around 4 or 5 pully's to the release point. I suspect
not a lot.

--
Cheers
Dave.