Here's how I made the markings.
First I made sure it was connected, then I took a couple of post-it notes and lined them up on both sides of the pda so they were borders. The sticky side was adjacent to the pda on either side.
Next, I took a pencil and made marks where the mirror was when fully extended.
Third, I did all this with the left edge of the pda holder aligned w/the right edge of the IR on the keyboard. This way I always know where they go in relation to each other. Consistency is key.
Fourth, I took a thin permanent marker and drew lines along the post-it note borders, and then I drew lines showing the angle of the mirror.
Fifth, I will take a flat board, probably one of those boards that has like a beanbag bottom and is meant for working in bed (
http://www.overthehillgifts.com/laptable.html), and will put velcro down so that I can work in my car and easily align the keyboard and pda holder and make sure they don't slide. I will also put velcro on the back of the pda so it sticks to the pda holder.
If my description sucks let me know and I'll take some photos of my setup.
Steve