I used the same appraoch for all of my Toxin Sac applications.
Basically, I place them on the forearm, with the bulbous
portion of the sac near/at the elbow.
For each arm, 1 Toxin Sac Biomorphs from the Gaunt Sprue
(6 per sprue)
Plastic cement
Procedure
Clean the biomorph of flash.
Apply glue to the spot where you want the Toxin Sac (Hive
Tyrant arm shown)
Put down the Toxin Sac, and adjust position as needed.
Aplly a small amount of glue to the edges with a fine
tipped applicator such as Faller Expert to close any gaps
or reduce an unnatural edge/step. That's it! (Gaunt arm
shown for finished step below)