Purchased that "handle" for my Porta Mount last year and it works great with all of my refractors.
From Agana Astro: Kokusai Kohki Guide Handle for Vixen Porta / Porta II and Explore Scientific Twilight I / II Mounts. $70 is a reasonable price for such a robust control arm.
Here is the Tak FC-76DCU mounted on it. Nice balance and good control.
Is a "must have" for those alt az mounts, in my opinion.
You do not need the ugly dovetail. The tubeholder will bolt directly to the mount. Just remove the dovetail holder from the Porta II. See the photos of mine right above.