Plastic seals like these (of various sizes) are typically used by professionals these days. They do not shrink like wood and do not rot. The downside is that they don't taper, so you can't dial in the fit as precisely as you can with tapered wood washers. You can't just snap them off either, so one trick is to partially insert the screw, then the spacers, rotate them so they hang over the screw and the 3 inch size matches the width of the stud, and then the Screw to screw the rest of the way. It also prevents them from falling out when you work alone.
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