The secrets died with him
Rambow made cues into his 90's. I had many of them. I also spent a lot of time talking to the old man. Rambow was very paranoid about his helpers ever discovering his secrets, taking them, and going out on their own. He only allowed his help to work on certain projects. When it came to balancing a cue, he would go in the back, lock the door, and do the balancing in secrecy. All I could ever get out of him was that he used no metal to balance a cue, only different woods. There are no lead weights in the butt of an original Rambow cue.
the Beard