Bearings on my roller furling were frozen when I bought the 1980 Hunter 30' last summer. Have the replacement bearings and tried to remove the old ones. After spraying with Blaster and "tapping" with a wood block for 3 days the bearings broke loose. Was unable to remove drum and assembly. Have been using it since but would like to do it right when on the hard this winter. Any suggestions on the brand and proceedure?