Thanks for the suggestions.
Update: I sent the vaquero back to Ruger on 11-18-08 and just got it back. I had asked them to replace the front sight and check the gun because it didn't lock up all the time. They went through the whole gun and replaced the barrel, the cylinder, the basepin, the hammer, the trigger, the ejector rod housing, all springs and repaired the grip frame. I basically got a new gun back.
They didn't charge me anything. I haven't shot it yet but can't wait.
Another satisfied Ruger customer (I own 10 in various configutations) and will happily but 10 more!
I only wish they made cars!!