Here is explaining how to do in text.
Take out rim-lock screws then take metal rims back side of plastic front both sides at first, then slide out plastic front from bridge side of metal front.
Good lucks
(Don’t bend metal rims too much, when take them out from the groove and bring them to backside of plastic front. )
(To put back plastic rims into metal front. Hook into bridge side first, then take metal rims in front of plastic rims and put into the groove.)