The 1/4" Whit. screws they sell in the hardware stores are the same thread pitch as camera mounting threads and all 1/4" Whit screws are 20 TPI . Just make sure the screw isn't too long and bottoms out in the camera, if you over tighten you can damage the bottom of the threaded hole into the interior of the camera body.
Have you thought of mounting an Ball Head onto the dovetail and mounting the camera onto the Ball Head, gives you much more flexibility for pointing at targets.
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