where would i purchase a battery for our crusader unit model A226 2121250 sn 80205287-7 230v 80watt 10 50/60 hz. we opened the unit label reads nicad 18v 1.2 ah part no 907005. at the moment it has frozen on the front read out showing 0 0 0 on the xyz on the anilam, and keeps blowing a fuse on the main supply cabinet,..under the machine harrison lathe. best david.