Is it possble to make adjusments on the Hyrax expander?

2013-12-31 Dear Doctors My name is Savio, I am 49 years old. I would like to ask you some explanation over a problem I had during a Sarpe surgery. I was recently diagnosed with transverse maxillary constriction with posterior crossbite. (Class I Malocclusion on Left), and the doctor recommended me a surgically assisted rapid palatal expansion. Only one week after the surgery and during the activation of the Hyrax, the result was a serious asymmetric expansion on the right side, with strong pain close to my ear and leaving me with a visible asymmetry on my right cheek. The left side, with more serious crossbite almost didn´t move. Unfortunately the surgeon was absent during the post-op and even when he was back, he said everything was normal. The orthodontist was forced to work on the Hyrax to reduce the asymmetry and eliminate the facial deformity I was with. He told me he managed to keep the minimum expansion that occurred on the left side, and at the same time he pulled the right side back to a satisfactory position. Talking a little bit about the structure of the Hyrax and its possible movement, according to my understanding. Considering there is only one screw on the Hyrax, and this screw once activated, will open sideward the four arms with equal force and simultaneously to both sides, causing the expansion (in a bilateral surgery like mine). In case of a blockage on one side (in my case it happened on the left side), the Hyrax force will still be the same to the four arms, but occurring some resistance on the left side, the major force will be thrown to the other side (my right side), causing the asymmetry. Based on this, I really cannot understand how the doctor may execute adjustments on each side independently using only one screw. His option was to turn the key to open and close the Hyrax, and any progress during the opening, with symmetrical or asymmetrical result, must have the same equal and proportional progress during the closing. In practice, there being only one screw to turn on the Hyrax, allowing only two movements, to activate or deactivate, my question for you is exactly about the possibility of the adjustment the doctor claimed he did. Do you think it is possible to adjust one side independently from the other, or any action done on this screw, will directly affect the sides simultaneously? I appreciate and thank you for your help Best regards Savio