craig

Usually the etched marking (stamp) is on the inside (usually), as @Mike says, use a light but it's very subjective in terms of everything else, we don't even know the window system or how it has been installed. It would all be guesswork but if aluminium and glass loose, it is possible that it's smart systems or Origin (more likely origin, which is actually Cortizo, at least the profiles are made for Origin by Cortizo).

Yes they can be retrofitted, you’ll lose the key. The fixing point is using the screw that holds the mechanism to the sash, you have a couple but generally only one supplies to space for it to work due to mushroom pin/keep locations. You can only use one screw (see above pic). I tend to cut the head of a screw put it in the other screw hole and fix with gorilla glue. The actual restrictor will fix into place easy enough. This option would be the easier and most cost effective option, as you can this yourself. A couple of quid per restrictor, then your time. Check warranty scenario though. We wouldn’t have any issue with you doing this but others might.

Yes Standard restrictors work but I can’t guarantee that the supplier will know how to fix them. They may say they don’t work but they do, they just need to understand what screw to remove on the mechanism and location. Which determines the finger restrictor position. I prefer side fixing but they can be fixed on the bottom.

Usually it limits the turn to 90°.

Misunderstanding, what I was saying was it's a replacement project and sometimes not everything has been taken into account or considered and sometimes it's wait and see what to do scenario after discussions with you if need be.

Yes.

They follow GGR guidelines, they’re the same in Europe basically.

Glass and Glazing Federation.

The internal cill height difference should have been taken into account. Cill needs removed, packed up and made good. It’s an oversight but it would need to have been resolved either way. External alu cill as expected but I’d expect coloured screws / cover capped screws for fixing. Along top externally, it's a replacement tbh and I’d expect things not to have been considered or a wait see result before finishing. I’d have expected a discussion to have taken place though.

Dinner has just been put on table, will come back to this.

Nothing wrong with 1: Discarding manufacturers straps for fitting. 2: Nothing wrong with find s solution on site 3: Nothing wrong with screwing into/through frame. 4: Nothing wrong with using an alternativd fixing method. As long as you or the installer are following GGR guidelines, I don’t see the concern. I do see the concern with poor installs.

They’ll cut it off, nothing to worry about.

You external cills will connect to this but on the other picture, the compriband (black band bottom) is far too high and really shouldn’t be visible, even at this stage of the install.

This appears to be the recessed section, we call transport bead.