Is that how they are rated? 200 MPH and to be used in a dry washer? sounds like a CAT 5 hurricane....

I have a different model blower, but I am able to use zip-ties to control the throttle on my blower. Just have to tighten the zip-tie to where you want the rpm of the blower. I have 3 zip-ties around the handle of my blower and I just slide the zip-tie over the throttle trigger to keep it at the rpm that I want. I use just enough throttle to move the material over the riffles so I will not blow the gold out of the machine.  

There is also a thing called a "Cable Clamp" (you can search for it on amazon and places) that should also work to hold the throttle, it is an adjustable heavy plastic clamp.

A strip of Velcro works well and is easy to find at the hardware store. It is sold in roles and is plenty long enough.

Thank you Leo, Melvin and Calvin for your replies! Funny, I was thinking of the zip tie method as well! The Velcro sounds like the way to go! Good luck out there and thanks again!