The depth of the replacement screw was slightly different than the stock screw for my Roomba 675. bracketed - both were too short. I found a tiny screw in my box of random screws that will work. I believe this is the type of screw that comes with Leviton-style plastic faceplates for outlets and light switches (it had a flat head and the top was painted white, so I think it came from one) - he stepped in the screw holder. and was long enough to catch and hold a bait without being too long.