Randy and 2.3,
Thanks for the suggestions, and photos. There are a few things I can still try before giving up hope and buttoning her up.
1. Devise a hook to grab the hole at the bottom of the pin. We've attempted this already but maybe can make something stronger.
2. Compression-fit a wooden cylinder inside the existing pin. Getting the correct size will be challenging, but perhaps some fancy pocket knife work will do the trick.
>> I'm concerned about mushrooming the top-side of the pins. If this happens, the pins will a) seize in the sleeve and not remove and b) not function for driving anymore...
3. Something not-yet fully understood involving a machinist's tap. The challenge will be holding the pin from rotating while engaging the tap's teeth.
This is a toughy. If you guys have any more brilliant ideas, please share!