I need to replace my doorbell transformer in order for my Ring video doorbell to consistently have sufficient power. After searching long and hard I finally located the transformer, which appears to be EXTREMELY old (house was built in 1890). After pulling the cover off, it seems to be filled with some sort of black material (hard) so I can’t see any wiring or even begin to think of how to replace it. Any suggestions would be very helpful. I’ve attached a couple pictures for reference.