In article ,
Tim Jenkins wrote:
Just had wooden window frames replaced with uPVC. The old frames had those
magnetic sensors screwed into the Window/Frame. Whats the best way of
fitting these on the new uPVC frames ? I was told it invalidates the
guarantee if you screw things into them ?

For my patio doors, I removed the reed relay from the case and superglued
it inside one of the cover strips in the door jam, and screwed the magnet
to the door, although it could also have been glued. The wiring was easy
since all the frame is hollow.

Not tried with a window, and of course I installed mine myself so could
dismantle it as necessary - not so easy when it's been fitted.

--
*Beauty is in the eye of the beer holder *

Dave Plowman London SW 12
RIP Acorn