And here are some links for figuring out your Steadicam Merlin...
I'll begin with a link to a good TUTORIAL VIDEO by Shiv Kumar on setting the Merlin up for the Canon XHA1. The general principles will apply to other cameras.
Here is a BLOG POST by Steven Dempsey on his experience setting up his Merlin with the XHA1.
And here is a FORUM DISCUSSION on Steadicam Posture over at DVXuser.