RE: AME 061 Needle valve which one?
I've never refitted a Norvel with a different needle valve, but both the Texas Timer and Kitting it Together needle valves are good items.
The Texas timer NVA is .125" in diameter and presses in with straight knurls to hold it in. It has a replaceable nylon friction seal.
(These NVA's are actually surplus or over production Cox parts originally used in their "product engines".)
The Kitting it Together NVA is .160" in diameter and is held in place with a threaded nut. It has an adjustable friction nut on the needle.