The Collaborative International Dictionary of English v.0.48:

Chinse \Chinse\, v. t. & i. [imp. & p. p. Chinsed; p. pr. &
   vb. n. Chinsing.] (Naut.)
   To thrust oakum into (seams or chinks) with a chisel, the
   point of a knife, or a chinsing iron; to calk slightly.
   [1913 Webster]

   Chinsing iron, a light calking iron.
      [1913 Webster]