Once the monofilament is inserted in the braid, make a small exit hole, remove the needle and trim the mono before pulling it back into the braid. Then use rigging floss to whip a 3-inch section to cover the transition. Starting about an inch and a half above, whip down using a series of half-hitches, tightening each knot as you go. Then finish with three inside hitches and gently pull tight before trimming the tag end. The splice will easily pass through even the smallest roller guides.