“Home Improvement” had a quality that all sitcoms strive for: chemistry between leads Tim Allen and Richard Karn. Allen, now 67, and Karn, now 65, starred together in the hit comedy series for eight seasons from 1991-1999. They played Tim Taylor and Al Borland, respectively — hosts of the fictional television series “Tool Time.” Now, … Continue reading ‘Home Improvement’ stars Tim Allen, Richard Karn on reuniting for new series: A ‘live version’ of ‘Tool Time’