Elastic is definatly the best way to hold the rudder stock in place on the pintles, and can be tricky to do sometimes, I lost one rudder and wrecked the back of aqua twice from the stock migrating up and one of the pins comming out.
what I was meaning was ensuring the blade is all the way down, if it is slightly back then the helm will feel very heavy, over time the holes tend to wear and let the blade come back at speed.
I prefer to angle my rudder blades a bit forward to balance them a bit, it was particularly useful on Primal where there was a lot of side load on the rudder, but with the blade balanced the helm was still light.