Give Tinkee's Letter to Felnok Steelspring.
I have another favor to ask of you.
My initial study of the essence you collected shows that it might be possible to freeze dragon whelp eggs and preserve them! I want to test this theory, but first I need specially made engineering components. My colleague, Felnok Steelspring, can make them.
Here, take this letter to Felnok. It tells him what I need. You'll find Felnok in Winterspring, in the town of Everlook.