I have had a heck of a time installing the ujoint bellows retention sleeve on my mercruiser. I have switched the bellows to OEM, used PowerTune and also used the Retention sleeve installation tool all to no avail. The new bellows is 'notched' in the groove on the Bell Housing Assembly (that is loose and was removed to permit installation of the water hose and exhaust bellows) but I can't get that sleeve to fit into the bellows. Any tips? I am really at the end of my rope on this job and there are no marine mechanics available (Colorado) until August.