I'm sure I've seen mention of this technique in the archives, but can't find it now. Idea being with my very uneven gaps on softwood casement openers, to:
1/ Open window 2/ Cover opener contact points in suitable release agent (Cling film, silcone or PTFE spray?) 3/ Seal on to frame in the proper position of a typical draught excluder with low mod silicone. 4/ Close window to vent position 5/ Time passes... 6/ Open and trim with knife as necessary. 7/ Have lower bills and more comfort.Anyone like to add anything to help task satisfaction, esp concerning release agent.
-- Mike W