Spray some glass cleaner/ soapy water on the glass first, the back lip of the bead needs to sit into the groove of the frame, some times you need to angle it first to start it off
Side trim noted to have some internal damage. This was caused by nylon tape installed by the suppler. You had to pull the tape to fully release trims on the side lights.
The damaged leg on the beads fits into a groove first and then the front knocks down, the damage has occured because while knocking the bead in the leg has jumped out of that groove and crossed over to the outside of it hence you have a bump in the bead and it won't fully seat.
Straighten the damage with a pair of pliers or gently heat with a heat gun, extruded pvc has a memory and will find its original shape
Then have another go
Trouble is its wickes, wickes = cheap, cheap = headache
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