At the moment I am off work due to middle spine problems.It may be due to being a plasterer for 23 years lol.By the way if there is anybody out there needs advice on this or any other D.I.Y problems be feel free to ask e.g plastering,roofing ,tiling,flooring:floor tiling,laminated flooring, concrete and screeds and many diy jobs in the house I will gladly answer if possible.MY ADVICE IS TOTALLY FREE.(I,m back in work now I am now a sign maker.)