wrote in message
oups.com...

Stuart wrote:
I'm trying to figure out why the
window won't stay up as it won't have got heavier

There is a possibility that the window may have got heavier if the
glass has been replaced as this could be a different weight to the
original glass.


Yes, a fair possibility. One easily missed. I will look at the supplied
link.
Thank you.

Sylvain.

The other advice on things to look out for though is spot on.

This link may be of use.

http://www.sashwindowspecialist.com/diyguide.html

There is also a very good section in the Reader's Digest DIY Manual.

I use to own such a manual, but donated it to a charity shop. It must have
been an early edition, which I decided was now redundant.

Sylvain.