Timney, Boyd, Canjar, are common triggers you may buy from Brownell's Inc which will come close to fitting the Blackburn trigger you have. There are other replacement makers too....Dayton Trayster, Dressel's, etc. These are all listed in the Brownell's catalog. I believe the Blackburn trigger was inspired by the Timney trigger but am not sure. Ted was a man of many talents when it came to metal as a gunsmith.

Dennis Earl Smith/Benefactor Life NRA, ACGG Professional member