the bushing in the center of the hr hand middle has moved/slipped remove the hr hand finger insert a good fit screwdriver in to the square and turn the bush slightly if the clock now strikes before the hr ,advance the other way slightly (may need to repeat this more than once ) when happy apply a TINY,TINY AMOUNT of SUPER GLUE to the outer edge of the bush (allow to set dry) ,refit to clock.
wirecutterman
January 2010