Usher Be20

I need some help on how to safely remove grilles from woofers.

Also would like to know wich improvements I can have filling their base with lead or sand, if someone tried.

Thank you.
Does anyone know if the original 8871's have a chamber for leadshot?
Gpr does a xover and wiring upgrade for a very reasonable $500-650. Depending on options. 
There’s 2 pairs for sale right now and they have to be one of the easiest hi end speakers to drive I ever owned. If I had the room they would have been my last pair.