wrote in message
...
On Sunday, 14 August 2016 21:05:26 UTC+1, Yvonne wrote:
Is there some mechanism that can be attached that will allow one to raise
the lower sash to different levels- depending on how much fresh air is
required, and then lock it in the selected position?

https://www.locksonline.co.uk/Window...h-Windows.html


even after watching the video, I still don't get how it works?

Anyone help?

tim