The concord/lord combination might not all have frankenrazor potential you would expect.
The first L6 I recieved has a short thread stud on the head and deep thread start in the handle.
The second one has longer on the head and less deep in the handle. 2nd handle works fine with both heads, first one is not good enough for either.
I only have one concord so I can't judge their consistency but the only frankenrazor I can make is the concord handle on the 1st lord head.
2nd lord head does not screw all the way in the handle, both lord handles are threaded too deep for the concord head.
Joris (not the razor). If you consider it as a hobby, you shave for free.