It is crimpable! Tierra Cast Crimp end cap in pewter  have a 4x2mm opening accommodates a wide range of materials. Add a dab of glue and crimp the cap with nylon jaw pliers for a very secure hold.
Width (mm): 7.6 mm
Height (mm): 11 mm
Inner Diameter (mm): 2.2 x 4.4 mm
Loop Inner Diameter (mm): 2.3 mm
Sold individually.