My dryer vent on the outside of my garage is coming off. It was held on by four screws, three of which have now come out and the fourth one is ready to come out. The garage is old—constructed with wood, and stucco on the outside. The stucco has crumbled where the screws were. I called the handyman, who was going to come over and fix it. Problem is, he is unreliable and of course, never showed up. So, I would like to fix it myself. Would filling the holes with putty and putting the screws back in work? Any suggestions would be appreciated. Thanks!