colar is off

After 8 hours of heating, picking, cutting, grinding,twisting, prying, banging, crying, and bleeding the damaged collar is off. I have a new respect for 100 year old cast iron pipe technology. The siplest ring cast into the colar of the pipe accepts the molton lead to form a bond that will support hundreds of pounds of iron pip below. If the rest of wall of the pipe below didnt rust out the life expectancy of this instalation would be indefinate.