When I compared my flap actuator extrusions against the drawing in my manual I discovered that they were about a half inch short in height. A quick call to Glasair and they shipped be two new fittings at no cost to me. Pretty good customer service considering this kit is twenty five years old, I am the third owner, and Glasair has been bought and sold a few times in between. Also notice the fact that the parts are now supplied complete with no further work required by the builder. I think most of the parts I am working on now are probably supplied completed in the newer kits. I did get into this to learn new skills though...