Opportunity Knocks Twice, Part II: It's Knot a Problem

You know that scene at the very end of “A River Runs Through It,” where the actor portraying the elder Norman Maclean is tying a fly onto his tippet?  He looks thoughtfully into the distance, then the scene switches to a tight shot of his slow and shaky hands.  Being unable to tie knots on the river means an end to independent fishing, so a solution is needed.