Allen screw

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Allen screw

[′al·ən ‚skrü]
(design engineering)
A screw or bolt which has an axial hexagonal socket in its head.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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We, however, lay drained and demoralised at its feet, with one remaining Allen screw boring a hole in our nerves.
Once that setting has been accomplished and the Allen screws retightened the barrel bands and Allen screws need to be hit with Loctite 290 Wicking Grade to "weld" everything in place.
It is accessible without being obtrusive and is easily removed with a single Allen screw if its presence is unwanted.
Also, there was no Allen screw in the bottom of the plunger hole, but there is on some guns.
The rear sight, additionally secured with an Allen screw, retains the firing pin block and its spring.
There are two tiny allen screws to adjust the laser diode for windage and elevation and a pair of wrenches--plus some swabs for cleaning the front of the laser--are included.
Loosen the three screws, spin the ring until two steel stopping pins contact each other and retighten the small Allen screws that hold the ring.
Laserlyte does not stop there as the bottom of the Sub Compact V2 accepts a small Picatinny rail, which attaches to the bottom of the V2 by sliding the dovetails of the adapter onto the mating system of the V2 and attaching with two Allen screws. This attachment has two rails for allowing the use of a flashlight or other accessories in addition to the red dot Laserlyte.
Two small allen screws adjust windage and elevation, and a solar cell provides most of the power, although there is a battery if there isn't enough light.
All you have to do is loosen -- and then tighten -- two Allen screws to change barrels.