Because I'm clairvoyant and can see the future.
Some personal tragedy will unfortunately befold you, and you will be forced to sell your bikes.
I predict, that the buyer for that fine original 1936 Safety Streamline, will be John Atkinson of San Diego.
And since he happens to be one of the best metal fabricators in the country, my thoughts are, why not let him do the repairs, since the bike is probably going to be his anyway.
Just my two cents, nothing personal.