AKG C411 Series User Instructions page 12

USE
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Figure 5: Pressing the adhesive compound on the underside of the pickup
1) Remove the backing from the supplied adhesive compound.
2) Press some of the adhesive compound (just enough to cover
the "footprint" of the pickup) on the underside of the pickup.
3) Press the pickup onto the bridge of your instrument or onto
the soundboard, near the bridge.
C411 MANUAL
III