bleeding brakes

[hope]

1940 tudor.


Here i am again, still chasing brake trouble. Its getting too much for this old man........
Bled the rear brakes o.k. with no bubbles, so on to the right front and the "bleeding screw is loose" upon just cracking open, so its letting air in the clear bleeding tube to the bottle.


Front cylinders are NEW (most likely Foreign made).


Question is: where can i get good ones?


Hope


P.S. Have to leave it alone for a while, because of so much frustration.