Just a quite suggested reading post -
http://www.weaversschool.com/resources.htm and download the article called 'Countermarch Looms - Everything you've ever wanted to know'. After you've done that, print it out and GLUE IT TO YOUR COUNTERMARCH LOOM.
Ok so it's mainly written for Glimakra looms but if you read it very carefully, as well as look at the pictures, and make a few educated guesses, you'll end up with a lovely shed.
I have recently spent hours and hours getting a really fussy countermarche loom working - and I finally did! I was so stunned I needed a Campari! But I felt so good for actually conquering it - I haven't felt like that for ages!
I hope it still works tomorrow and I didn't dream it..