I have a Stamina UX2 airbike that had to be taken apart to get into my car. I tried to put the nuts back in that operates the handlebars and the pedals together, but the nut keeps pulling back out. What am I doing wrong? Also I cannot get the gauge back together. I'm trying to see the manual for this model. Please help? THANKS Constance Lee, leeconstance1947@gmail.com, 916-965-8882