Looks like you've removed the allen bolts, it's probably never been removed and is sealed in place...
You could try putting a sacrificial screw into the hole where the shower plate screws on and go at it with a pliers?
Or if you plan to replace the gasket, you could try lever it off with a strong knife?
I'm sure someone more experienced will be along to tell you the best way to do it...
Thanks for your quick replies. Yea, the allen bolts are out already.
Yea I just tried this, alas my "sacrificial screw" is not that long either so no luck yet..
@salad started
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Looks like you've removed the allen bolts, it's probably never been removed and is sealed in place...
You could try putting a sacrificial screw into the hole where the shower plate screws on and go at it with a pliers?
Or if you plan to replace the gasket, you could try lever it off with a strong knife?
I'm sure someone more experienced will be along to tell you the best way to do it...