You are welcome Keith. A picture is worth a thousand words so here is one which links to my previous post here:
An OR rear visor..wet and then blocked. This one comes from a Prussian helme in similar condition to Andrew's...collapsed like a deflated football. The rim of the shell was soaked using strips of paper towel and H2O, plastic was placed behind the liner fingers and an antique hat stretcher was placed inside the shell to block it back into shape. It is still drying as we speak.
An OR rear visor..wet and then blocked. This one comes from a Prussian helme in similar condition to Andrew's...collapsed like a deflated football. The rim of the shell was soaked using strips of paper towel and H2O, plastic was placed behind the liner fingers and an antique hat stretcher was placed inside the shell to block it back into shape. It is still drying as we speak.