[okie]

I believe that Loren Roberts does use a vertical hinge. The thing to remember is to match the path of the club head i.e. covering the plane line as opposed to tracing it. I prefer angled hinging with a push basic stroke because you do not have to think too much about executing a hinge action. But I also discovered that being "on purpose" is a good thing to i.e. settling your intent to execute this or that!