My apologies Jeff and the A-P group, and glad you looked closely. I was mistaken, I have the Seahorse 920, and NOT the 830. It has a width of 13.88 inches, which is critical to get the width of the mount to fit snugly. The Mach 2 would never fit into the 830. 

To be clear, pictured here is the Seahorse 920
Ernie