Hey Guys, great thread.. joined the club a few weeks ago, found a HUO locally that looked like it was hardly ever played and thoroughly enjoying it now. One thing that I noticed was even after a few days of playing, the silver ball target started to wear even more showing white so I was frantically looking for solutions to protect it but with no luck and a reproduction was not easy to find, I saw on the forum that someone cut in a pinball in 1/2 which looked cool but wasn't as practical as would've liked.. an idea popped across my mind to use a mirrored silver Christmas ball ornament that I saw on my tree as I bought a pack with a few sizes in it. I cut one in 1/2 with a thin dremel wheel and it turned out to be almost exactly the same material as the target, maybe a stronger finish being new, I attached it with double sided 3m tape and it works perfectly, hope this helps with a solution for others.
Video here:
https://www.dropbox.com/s/e4qe6oemee5lanq/video%20dec%2006%2C%2010%2046%2059%20pm.mov?dl=0
Silver Ball (resized).jpg