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That would be Loctite, although why anyone would bother with it on a
scope beats me. Medium strength Loctite can be softened with acetone, but it takes a while to seep into the thread if the surface under the head of the screw is very smooth, as the painted surface of a scope would be.
High strength Loctite can also be softened with acetone, but is more successful if the head of the screw is removed to allow the exposed end of the screw to be really soaked in the acetone. In less critical situations
such as on heavier machinery, it can be dissolved with a blowtorch.
raymo
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