Turn the item over onto the reverse side. Carefully cut the bobbin thread. This will be in the center of the stitch and usually white in color. After cutting this flip it over and pull out the thread away with a pair of tweezers.

No, "head" is not a short "e" word. It has a long "e" sound.

2, preferably a pair, but if you want to mix it up, use two different types. You will also need buttons for eyes and embroidery thread. Of course, you will also need regular sewing stuff e.g.. needles thread etc.

There are many different thread forms in use today. The most common are;

BPV thread

API thread profile gauge

Thread profile gauge

API 5b thread gauges

API thread gauges

Pipe thread gauges

API Thread Gauge Manufacturer & Supplier

Ring gauge use

Pipe threader

Acme thread

Feeler gauge set

Ring gauge set

threaded pipe plug

step gauge

NPT thread gauge

Tapered pipe thread

EUE thread is a pressure sealed thread as usual completion pup joints thread