Till the Blood Runs Clear - S1-E11
Visible crew/equipment: After Aeryn tells Furlow that she cannot see, it cuts to Zhaan as she enters the command deck, and when Rygel asks her if she's fully clothed Rygel lifts his arms to cover his eyes, and we can see both of the puppeteer's arms up in both of Rygel's sleeves.
Till the Blood Runs Clear - S1-E11
Visible crew/equipment: After Aeryn and John escape the pull of the wormhole it cuts to Rygel on his hoverchair, and when D'Argo walks in we can see the black hinged base under Rygel's hoverchair that enables it to move across the set's floor.
Chosen answer: It's never explained. John mentions a theory that his less technologically developed craft simply interferes with the wormhole less than the "superior" Vipers, but they never make a concrete determination on that point. But we also have to take into account the fact that Moya traverses wormholes with no ill effect as well.
Garlonuss ★