Refurbing rear 9" drums on my '72 Demon

Alright, tried bleeding the brakes again this evening. I'm getting drips out of the rear both left and right. Bled the front driver side and it squirts right out. Broke the bleeder valve on the front passenger side so it looks like I'm replacing that wheel cylinder tomorrow (hopefully).

Why am I not getting anything out of my rears? When I bled them the first time my neighbor (who is a mechanic and has done this before) did notice air bubbles from the hose into the brake fluid bottle we rigged up.:banghead: