window restrictors

Isn't that exactly what a casement stay does?

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There's plenty of variety e.g.

Cic.

If the window is open enough for anything the screw is accessible. I have those exact units and they never 'bounce open'

Everyone else seems to have missed your point John.

I think these are what you require

I want something with say a shorter stay with a long slot in it rather than a series of discrete holes, and a peg with screw down top - so you can position it to the hinged side and set it such that it limits the maximum opening.

Probably me not explaining it well enough ;-)

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I think you missed the bit in which I indicated that the item is an

The fact that the particular type you have has never been bounced open by gusts of wind is really no guide to how the many other types will perform especially as many of them are made from light weight aluminium. I can assure you that I have often in the past had windows bounced open in windy weather which is why I fitted the screw-top pegs I mentioned and which are sold for that very purpose. I hope this clears up the doubt about the intended purpose of the items I mentioned even if they don't meet with universal approval.

Cic.

the iron ones you linked to, are pretty much bounce proof except in a full gale and we tend to shut the windows than :-)

I fully agree that the aluminium ones are not worth having at all.

had them in a previous life - always knocking them off.