One of my all-time favorite repair videos is this one in which an older gentleman with pronounced hand tremors easily repairs a knuckle coupler and demonstrates a great trick to the hair pin/rivet/knuckle mystery--he applies a dab of gear lube to the tip of the rivet when he installs the hair pin which holds it in place when inserting the knuckle.
The real action occurs at around the 22:00 minute mark; the prelude to this is a deep cleaning of the assembly.
His video allowed me to make quick work of just such a repair; astonishingly simple.
