You might want to try
using plain dacron line. On my Oday 25 I just drilled a larger hole in the CB and installed a 1/4 in. line and it worked fine. The knot at the CB should be close tied and the knot should be small. I think I used a square knot. The CB for the Oday 25 does not weigh much, so the 1/4 in. line is just fine.