I have an AzureShine LNBF bracket that's factory designed for the smaller throat diameter LNBF's (such as DTV etc) as opposed to FTA 40mm opening. The bracket is actually designed in 2 halves that snap together around the LNBF throat. I've got a Dremel tool but I'm not quite comfortable doing it this way as a little drift and the bracket opening could end up to wide and that plastic bracket melts pretty HOT
and quick.
Any thoughts regarding how to cut the opening bigger in a more "uniform" manner?

Any thoughts regarding how to cut the opening bigger in a more "uniform" manner?