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how the hell anyone decided these 'mouse trap' design were adequate for anything is a mystery.. but (best I know) the yellow will go through by holding to the lamp, the red won't and it'll feel like you are at danger of braking the plaster pushing them in (and you are) ... then you've no idea where they are sitting or if the spring tension is about to blow but they should sit.
[There's a slim chance the ceiling replacement has changed the plasterboard thickness] but by all means take the springs off turn them around and place in different settings to try and achieve them to reasonable working order - but they just say mouse trap to me
Plaster dry, time to put the light back. Of course it's not easy. Any YouTube is no help.
These yellow bits will push in enough to go through the ceiling hole, but not the red bits.
How do I do it? The red bits don't seem to move enough in any direction to fit.