I am doing a CLA on a Sinar Norma following Philip Morgan's excellent directions and Video and have run into a problem. I can't remove the fine focus assembly from the monorail sleeve. This is a steel part in a snug aluminum hole and I assume that after 50 years it has seized and won't budge. I have been soaking it in PB Blaster for 24 hours, and have tried heating it with a butane torch. I have also liberally applied swearing—all to no avail. Before I resort to explosives is there anything else I can try?