In a quick cut die stock, the two die halves are held securely by:
A threaded guide plate
A quick-cut die stock holds a two-piece (split) adjustable die used to cut external threads. Because the die is in two halves, the tool must both locate the halves side by side and clamp them so their cutting edges stay concentric and set to the correct thread size.
In this design the two die halves are seated against a guide plate fitted in the stock body. The plate positions the halves and carries an adjusting screw that bears against them.
Tightening the adjusting screw against the plate presses the halves inward, holding them securely and controlling the amount they open to set the thread depth.
Because this plate is threaded to receive the adjusting screw, it is called a threaded guide plate, and it is the member that actually retains the die halves.
A tapered retaining ring (option 2) belongs to solid button dies, not to a split die stock, so it does not hold these halves.
A spring-loaded clamp (option 3) or a locking pin and washer (option 4) would not provide the fine, screw-controlled adjustment of opening that a split die needs, so they are not used here.
Hence, the answer is A threaded guide plate.
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