machinists would remake a bolt to exact same diameter and threads per inch etc. as for the function of the bolt, I believe it said it was an adjustment bolt which doesn't sound like it needs to be able to withstand pressures, but a machinist also looks at what the function of a part is and determines what material/strength is required. I can almost guarantee it would have worked.
the only reason I could think of was that he wanted to keep it original, but the bolt was fabbed in germany, not remaining original stock, and he added/modded many other parts anyways.
but yes thank you for the interesting read. I wonder where/if all the medallions were sold.