My guess is…..
Dig out the old lume. Cocktail stick might work. Failing that a needle or tiny screwdriver.
I would mask around it just in case you slip.
Shine a torch on the pip to see if one side is brighter than the other.
Brighter side up.
Test to see if the pip fits before you glue.
Tiny bit spot of superglue on the bezel. Then drop in position.
It might not do any harm calling the UK Sinn service agent and asking them. I have found them very helpful in the past.