How to fit Rehau Rio Fixed Casement?

[jayc89]

Got a Rehau Rio to fix. One side opens, the other side is fixed, but it looks as if it should open, so there's quite a depth to screw through, which doesn't feel right, does the fixed side somehow come out so I can screw through the frame only?

(I know lugs would be better than screwing through the frame, but apparently they're not available for Rios... 

[Russell griffiths]

Flat steel plate with multiple holes in it, available from most builders merchants, screw this to the frame to use as a bracket, not the thin builders band, these are 75mm x 120mm flat plate. 

You can cut it into 2-3 bits if you want. 

[jayc89]

Figured it out. Turns out the fixed section, isn't fixed, rather it's a top guided window that's screwed shut (no locking mechanism).

I wish I had thought of @Russell griffiths suggestion ahead of time though!