I recently purchased ROBQ0539-this is the robostrut suggested for the Great Planes 81 inch chipmunk-I am running a 0S 120 four stroke which is also suggested-My problem, the struts are fully collapsed when model is sitting on ground with no fuel and the model is all stock-Are these struts adjustable- or is there something else I might be missing- I really do not think this is normal-Any ideas?thanks