03-10-13, 12:39 AM
Mine had a similar problem a few years ago, the action felt rough through the lever too.
I found about half the ball bearings in the actuator were knackered. (It's easy to mash the heads of those two screws, heating the alloy casing up a bit first helps.) Luckily I had some bearings of the right size and the helical grooves in the mechanism weren't too badly affected… it's been OK since then.