Here's a step by step for a goldhead bloodworm. Its a great fly to try when the fish have turned off the apps bloodworm pattern.

Hook - Kamasan B175 Size 10-16
Thread - Red
Bead - 2 to 3mm Gold Bead
Body - Red Marabou
Rib - Fine Silver Oval
Tail - Red Marabou
Thorax - Red Seals Fur, SLF or Hares Ear

Goldhead Bloodworm ~ Step by Step