Constant air when bleeding

What, or who's, new master?
No name generic 15/16s chrome unit. Maybe it’s time to pull the trigger on a Dr. Diff unit and see if it’s the master. Hate to just throw money at the problem but I’ve been trying to bleed it for a few days now and nothing is working. Lines and flares are all good. No leaks. Bleeders are all up. Grrrr!