Just received my Summer edition of Revival, and its as good a read as ever.
Most interesting article from Adrian re HA Temperature switch sender replacement.
Having just gone through exactly the same problem, and finding a new one difficult in the extreme, even with the help of Members on the forum, I must have jogged Adrian's memory to notify Club of the modification listed.
I actually had some difficulty in removing it from the head, but it shifted eventually!!!
A long search finally unearthed a second hand unit, which actually works ok so, after a 10/15 mile drive through town, country and a short section of motorway, all appears well, at the moment, and the needle moved up and stayed in the centre position!!
I am still going to contact Adrian for a replacement, just to be safe.
Bob HA130