Well, based on the way my Lady Bug flew tonight, I concluded that some downthrust is in order. The only problem is that the TD .020's backplate mount has only two screws at 180° spacing, so my usual method of adding washers between the backplate and firewall won't work. Perhaps I'm just tired from a long day, but I'm fresh out of ingenuity. I've been staring at this for a half-hour and can't think of a good easy way to add downthrust. I thought about making a little shim out of sheet styrene or some other fuelproof sheet material and placing it between the top of the backplate, but it seems like it would distort the backplate and be less than secure. The only other thought I have is to make a new plywood backing ring like it mounts to now and sand the desired angle into it, which will be a pain, time-consuming, or both. Anybody got an easy solution? Maybe I'm worrying too much.