Air filter top flange

[melowen344]

Does anyone know the best way to preplace the top flange on a S3 air filter box? The original flange has broken but I want to keep the box as its an original off my SX150 (complete with innocenti part no stamping).

Is this flange soldered , welded or sweated on? is it easy enough to grind off with a dremmel?

Any advice would be appreciated, but don't say buy another complete box, I've already got one and this will be the donor flange.

Cheers to all, Mel