Capt McHale,
Thank you for providing such details regarding mechanical cable testing, installation, and stretch when flying with a jammed column. I was aware of this scenario being evaluated by test pilots and determined to be acceptable for continued safe flight and landing, but did not know how much elevator motion it is able to provide. I find it quite sobering that 4 degrees is all you get. The flare prior to touchdown will be compromised, but everyone walks away for a landing with a 10 ft/sec sink rate. It would be a firm one, but acceptable given the very low probability of such a failure. I'm not aware of any 737 encountering this failure in flight.
Regards,
FCeng84