My suggestion is not to glue them in. The hole layouts should line up like laying out dowels. If you use the correct diameter bit, and the depth is correct, the barrel just presses into the hole.
There is no real adjustment for those, and it may be necessary to "turn" them to align perfectly so they open and close without resistance. In installing them, their depth for both barrels should be set to allow closure and a very close fit of the lid to the box. There should be a set screw to expand the barrel in the hole once installed. I've never glued them.
This finely crafted, solid brass barrel hinge is just right for small to mid-size boxes and assemblies. The miniature barrel hinge installs into a 5-mm hole drilled into the base and lid of small boxes and pen presentation cases.
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