Keith,

What I mean by tri-stock, is go to your local hobby shop and purchase a strip of 1/4 triangle balsa. Cut two pieces the width of the plane and glue to the front and back edge of the landing gear plate on the inside. I believe I used 30 minute epoxy to glue the triangle into place and I also spread it around the on the inside of the fuse near the plate. Just a very light coat.

I hope that helps.

Dave