I have a Jazzmaster and Jaguar. I really have bonded with both. The only issue I have is with the tremolo in the Jaguar. I assume it is a MIM unit. It is stiff and not as smooth as the unit in my Jazzmaster. The JM unit is clearly a different part-it ha s the slide "lock" switch-the Jag unit doesn't have this switch. Is a MIA unit a direct replacement? Any help will be appreciated.