[razortw]

Originally Posted by fiberglass.supply

I want this too 4.6.6 gold

In 4.6.6 it can actually be done via admin area, product variants page.
There is the 'Def' column in the variants table that indicates which varaint os the default one.
Check this out:
* http://i.gyazo.com/1d5d296c3f2ec69a245f38dad7a6d961.png