Send email to robertwhiting76athotmail.com I'll send diagram on how I was told to by a master plasterer who plastered churches round windows been their done that he was brilliant.
in the email address change the 'at' to normal email symbol as full email addresses canont be posted on this forum. How is the arch constructed pre-formed wire arch or one you've made and what shape norman, gothic half round ? send a picture.
I'll wait three days for an email then assume you've done it.
Bob, September 2009