Hey LB...

Yes, I Dremeled the slot out where needed to keep the engine centreline in the same place as the original design, but that is nothing to do with right thrust, it is centreline offset and really doesn't affect the tracking of the airframe.

Right thrust is achieved by packing the front engine bolts with one or two washers to 'point' the engine to the right (when viewed from above).

I have one washer under each front bolt and it tracks very straight.

To test if you have enough, on a calm day (or with wind in your face or at your back) pull up into a vertical climb with the top of the plane facing you and let go of the rudder stick. This is assuming you have trimmed the airframe and the flight controls for a hands off flying plane beforehand.

If the plane yaws to the right, you have too much. If it yaws left, you don't have enough.

Have fun!

Goose