you need a plastic pill box lid which is just smaller than 52mm and a rubber kitchen glove cut glove to a doughnut to fit name ring unscrew name ring.

Normally there are three screws holding a brass ring secured with nail varnish ~ remove varnish with nail varnish remover cotton wool soaked in on end of match stick back of screws one turn then reset infinity on star or moon.

tighten screws they don't need to be tight dab with garish nail varnish replace name plate

you need to be sure it is the lens and not the body...

send to repair shop is better...