Vixen Porta Mount
I've got the original model Vixen Porta Mount and your comments are dead right. It was close to perfect for the weight of my 40mm Coronado PST solar scope but is only just adequate for my 60mm Lunt double-stack. When I tried it with an 80mm William Optics Zenithstar (~5kg, from memory), it was woefully overloaded.
It is also incapable of sufficient vertical extension for lengthy comfortable use by an average height man. If I spent too much time using it, I'd end up looking like the Hunchback of Notre Dame! Presumably it was designed with the typical Japanese physique in mind.
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