Bought a new trackpad, installed it, fiddled with centering it, loosened the click adjuster screw and it would hardly click if I pressed real hard, just like the old trackpad. Problem solved by putting two 1/32" thick sticky pads under battery where the battery sits on the macbook frame near the lower bottom edge. The battery was new and not swollen but is was still too thick. Didn't need the new trackpad but now I have a spare.