Threaded, or quill, stems are used on many Diamondback bikes. This short video shows you how to properly install one:

1. Coat the assembly with grease up to the minimum insertion point (marked).
2. Insert and gently tighten the stem.
3. Mount and rotate handlebars, securing the faceplate bolts equally.
4. Align stem with front wheel and tighten stem.
5. Doublecheck bolt tightness and alignment.

That's it--you're good to go!