If you still have the white plastic "bead", just glue it back onto the sight base. It was glued on originally. If you no longer have the plastic, ask Krieghoff for a couple of extras.
If the whole base came loose from the threaded shaft, loctite it when re-installing.
Krieghoff front sights are made of 3 pieces. A threaded shaft, a sight base, and the plastic glued on bead. The bead generally are of the aaprox 5/32" dia.
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