You might use some sort of construction adhesive to attach the "stalagmite" to the gun.
Panel adhesive, which is similar to construction adhesive, can also be used.
When Lucy commented on the odor, he told her that he'd smelled it, too, and thought the aroma was from construction adhesive.
If the surfaces are smooth and plumb, lining can be attached directly with panel nails, construction adhesive or both.
As with sheet lining, construction adhesive can be used instead of nails.
In addition to, or instead of, screws, construction adhesive can be applied.
Fasten the strips using construction adhesive and drywall screws as described earlier.
Another way would be to put up rigid insulation panels with construction adhesive.
With the construction adhesive, it is not necessary to nail every piece.
Most construction adhesive contains solvents, and thus is flammable and dangerous to inhale.