If you are going to install an HDS 10 on it and want it not to budge, I would have a look at the following mounts:
Cisco (mentioned above) http://www.ciscofishingsystemsltd.com/shop/sure-lok-electronics-mount-5225
RMC mounts http://radioworld.ca/electronics-mount-c-3_769.html?filter_id=233
Here is a video for some mounting possibilities,