I had so many of these things I didn't know what to do with them all when I was a teenager.
Or if you happen to have one of the Old Time Family owned Hardware Stores in the neighborhood like a place I have been using for 40 years. They always have what I need even the most oddball shit the people at HD or TV never heard of.
I just had a thought and most of the RBA/RTA/RBTA's I have come with a spare part package. Did you happen to check the box it came in, @Alexo ??
That's because people from the neighborhood wouldn't mind spending an extra couple bucks for the higher quality customer service.
It's worth the extra money when the people know you by name at a store.