Irregular openings such as trefoils and other tracery need to have templates taken with consideration on how the final panel can be put into the opening.
In the cases where the whole of the rebate is exposed, it is normally possible to put the panel in as a single whole piece.
So, the template is taken as for any other opening. It is more complex and time consuming as there are so many more sides than in a simple rectangular or circular opening.
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