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How do I remove the handles from my 7 yaer old Pisa?

Have a seven year old pisa shower. Works well but now having difficulty in turning water on / off. Have replacemnt handles to be fitted but cannot remove the large dial over the water temp adjuster shaft.
Is this just a splined nut that refuses to move?
sean.m, May 2010
link Click here to see other fixes for Pisa 7.