I’m trying to fix this pair of JBL 4301B that I had fr years and only now could afford the missing tweeter. But now one of the woofers is giving me trouble too. I know I am not doing a perfect job because there’s LOTS of it I don’t understand so I do as I can. But can I leave the sound on to hear what’s happening? Should I wear gloves not to get an electric shock? Thanks guys!