I was able to buy some antique door knobs at the local Peddlers Mall for a rock bottom price. They were all crusted up and painted over, but a little elbow grease, paint remover, and ketchup (I use this as a non toxic metal cleaner/polisher) they turned out looking great.

Now the problem. The spindles for these door knobs are larger that those in modern locksets.

Modern locksets, at least the ones I have, do not allow for just the doorknob to be removed.

Is there any way to adapt these wonderful antique doorknobs to modern locksets, or is there a way to get just the doorknobs off the modern locksets?