I just ran a Google search for "Happ Super 4-way restrictor" and naturally I end up right back here where I should have started in the first place.
Sorry for necro-farming this thread, but I'm really interested in this product.
As far as compatibility goes, are there any potential issues I should be aware of, or is a 4-way Super a 4-way Super? I bought the stick about a year ago, if that matters.