I am working with and older gentleman and the problem I'm having is that he continues to climb until almost a stall. I know that he is pulling back on the right stick with his thumb. I have tried to get him to use the pinch method. No luck, says his fingers cramp. I don't think he can see the plane climbing. I keep telling him that the plane is climbing and he needs to relax the elevator. He does that and then he starts climbing again. Any suggestions as to how to instruct this person. We have had about 6 flights on the buddy box. I know the plane is trimmed out on the buddy box because I had another pilot use the master and I went on the slave. I would take my hands off of the sticks and the plane was straight and level.