The Altitude tension is set by three grub screws located under the plastic covers on the sides of the mount. With care you can remove the plastic covers (they are glued on) and replace the grub screws with adjustable knobs. This allows you to reduce the tension and allow easier altitude adjustment. When you have it set correctly you can then tension up the three screws.
I posted some photos in this thread:
http://www.iceinspace.com.au/forum/s...ight=hypertune