Yes the first step is to insure your prop is well balanced, both blades the same pitch and tracking straight. Because it has been overhauled is not insurance that all 3 of these parameters are correct. Prop shops are just like any other work done on your aircraft. It is always subject to sloppy work. As a whole most prop shops do a good job but not all and not every job out of even the good ones will always be right. That aside the next problem is one you are unlikely to be able to fix until the next overhaul. Aircraft crank shafts, connecting rods and pistons are notorious for poor balance. It is unbelievable how much you have to remove from the crank to get it properly balanced. These are very crude little engines and it is reflected in the vibration. Having flown an engine that was balanced when it was rebuilt I can tell you the difference is incredible. You do what you can with the prop, make sure your engine mounts are in good condition, chances are they need to be replaced, not a big or expensive job. The rubber mounts are usually only good for a few years. Last but not least keep your RPM out of the 1825 to 2025 rpm range, it sets up a harmonic vibration.
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