I've been locking everything down quite securely when leaving the boat - talking about tying off the tiller centrally and pulling on main sheet hard. Aim is to resist significant wash from passing ferries and stink boats. Wonder if this is "doing it right" given have detected some give in the rudder when tiller tied - could zero flexibility in the tiller create forces that weaken the rudder connection to hull?? (Pintels and gudgeons??). So question is - what to do with tiller, and what sheets/halyards to keep loose or tight. Note boat is folkboat with long attached rudder so may get more lateral force applied than a spade rudder for instance....