The way I did it was to let them come close to the nipples (they are so very curious) and then move the metal pin with my finger and let the water drop fall. Maybe you holding them to try to tap the nipple with their beak is stressing them a bit, I don't know about your two girls but mine don't like me to touch them, I can come really close to them though, as long as they don't see me as a threat.
Also keep in mind that wet environment is not good, I have sand on my run and move it around regularly to dry the area under the nipples (when they drink from them, there is always water falling off on the ground). Wet areas are good media for coccidia to flourish so try to keep it as dry as you can (this is why some people prefer horizontal nipples).
Good luck with your girls
Also keep in mind that wet environment is not good, I have sand on my run and move it around regularly to dry the area under the nipples (when they drink from them, there is always water falling off on the ground). Wet areas are good media for coccidia to flourish so try to keep it as dry as you can (this is why some people prefer horizontal nipples).
Good luck with your girls