ORIGINAL: rainedave
WEDJ, instead of using washers behind the mount to get your thrust angles, take a paper cup the diameter of the mount. Tilt the cup by placing a wedge under one edge and pour in some 30min epoxy. When it's dry tear away the paper cup and you have a solid, round wedge to place behind the mount. The epoxy will also absorb a bit of vibration from the engine.
David
That's a good idea! Years back, they used to make thrust plates, but I haven't been able to find any.