On Jul 10, 7:51 am, Stealth Pilot
wrote:

in the worst case where no one will issue new paperwork the owner
could surrender the registration then assemble a new aircraft from
various parts and ask for it to be registered.
if he can prove 51% then he is the builder for the new registration.

Stealth Pilot

51% has nothing to do with the issuance of a repairman certificate or
determining who is the builder.