Lodola fuel taps

Has anyone opened up Lodola 235 fuel taps before? The ones that open left to right, don’t have any obvious way of opening them apart, but feel like they’re a press fit in the main tap body.

Never tried splitting them, but if you have no luck you can get new ones from Non Solo:
http://www.nonsolomotoguzzi.com/catguzzi/rubinettioliobenzina/paginarubinetti.htm