My mother has some Critall Warmlife secondary double glazing. It is by now fairly old (I'd guess over 20 years).
Unfortunately, she cannot locate any of the thumbturns that hold the panels in places. They seem to be marked HPS011 (might have that wrong - I have not got one here to check). And of course, they break regularly.
Neither Crittall nor the companies that are approved by Crittall appear to have any intention of answering my mother's letters in which she has tried to get some.
Any ideas where to get some or for a substitute item?
Thanks