AFTER WORKING AND RUNNING FOR 3 HOURS ON A RETIREMENT PLAQUE FOR ONE OF MY EMPLOYEES, THE ----90 DEGREE BIT CAME OFF OF THE QUICK COUPLER WITH NO WARNING AND RUINED 3 HOURS OF WORK PLUS A $15.00 BOARD ALSO. NO LOCKTITE ON THIS BIT IF SUPPOSED HAVE BEEN THERE. TALK ABOUT BEING VERY FRUSTRATED AT THE LEAST.