I'm not able to watch the video from work but the Scotch tape works perfectly as a"NO GO" gauge. For a Savage action I assume you have a barrel vise and nut wrench. Here are the steps I use to set headspace on a pre-threaded and chambered Savage barrel.
First rmove the ejector from the bolt (be careful it doesn't fly across the room when you knock the pin out)
I like to remove the trigger also.
Hold the barrel in the barrel vise.
Swab the inside of the chamber area with a bore mop and then with a couple dry patches.
Insert the "GO" gauge into the chamber.
Thread on the barrel nut.
Slide on the recoil lug.
Thread on the action with the bolt in the closed position.
When the action stops, snug up the barrel nut with the nut wrench. (make sure the recoil lug is lined up properly)
Work the bolt and make sure it closes freely on the gauge.
I like to just loosen the barrel nut and slightly tighten up the action until I feel a slight drag when closing the bolt on the "GO" gauge.
Make sue the barrel nut is secure, and double check how the bolt closes.
Now attach a piece of Scotch tape to the rear of the gauge and trim off the excess with a razor blade.
Insert the gauge back into the chamber.
The bolt shouldn't close at all.
If this is the case your headspace is set.
If you have any trouble you might want to take it to a smith to set for you, it only takes a few minutes.