The alignment of the stuffing tube to the strut is not straight. This can cause excessive friction in the stuffing tube. And if the bend in the stuffing tube is not just right (alot of trial and error here) it will also build up heat. I have chased down alot of heat causing bends and alignments in my drives. There can be multiple reasons for a hot tube. The stub shaft may not be centered on the flex cable. Keep working on the drive line until you can keep the stuffing tube from getting hot.
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