I use a different system that allows for removal of the Zumo and the mount. Plug-in via Powerlet plug in the front cover. I put risers on the bike that use caps that open up the center of the handlebars, so the Zumo is mounted right in front of me.
Attached an eCaddy to the handlebars:

The other part of the eCaddy attaches to the Zumo mount:

The GPS, mount, and half of the eCaddy slide into the "receiver" mounted on the handlebars. The Zumo is right in the middle and perfectly, right below my line of sight, which allows for quick glances without having to look all over for the GPS screen:

For the entire write-up about how I mounted this, go to my website here:
http://www.valkyrieguy.com/gpsmount.htmI have since sold this Standard, but have transfered everything over to my Interstate. The only thing changed was where the Powerlet was wired. With the eCaddy mount, all that is left on the bars is the "receiver".