Help identifying part for roof blind cord

[corvusprodo]

I am trying to identify the part pictured which holds conservatory roof blind cords taut where there is no fixture.

It hooks on to a screw attached to part of the conservatory roof.

 

[Wayners]

This maybe?

Cord Tension button cover and base for pleated/concertina blinds (PL1011) | eBay

Cord Tension Button cover and base for use with pleated blind, Louvolite system. supplied 1 x base, 1 x cover. base max size 13mm x 11mm x 4mm.

www.ebay.co.uk

 

[corvusprodo]

This maybe?

Cord Tension button cover and base for pleated/concertina blinds (PL1011) | eBay

Cord Tension Button cover and base for use with pleated blind, Louvolite system. supplied 1 x base, 1 x cover. base max size 13mm x 11mm x 4mm.

www.ebay.co.uk

Ooh this looks promising - thank you.

Part of my difficulty was knowing what to Google.