bolt directly to the Porta Mount head without any modification to the mount. You
just remove the existing Vixen saddle and use the two bolts furnished with the
ADM adapter to attach it to the mount head. I have one and it works great with
my scopes that have Vixen dovetail bars or Losmandy D-series dovetails. The ADM
adapter holds the dovetails much more securely than the original Porta saddle
and without marring the dovetail bar. The part is DVPA-Porta Mount and it's listed
under the DV Series Dovetail Adapters on ADM's website.